diff --git a/wolfBoot b/wolfBoot
index 75a7e57..61fd552 160000
--- a/wolfBoot
+++ b/wolfBoot
@@ -1 +1 @@
-Subproject commit 75a7e57279b1c70ca741111705e98aff6307c333
+Subproject commit 61fd55252627595cfff261c4572593286212a10e
diff --git a/zynqmp-zcu102-wolfip/.gitignore b/zynqmp-zcu102-wolfip/.gitignore
new file mode 100644
index 0000000..89f9ac0
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/.gitignore
@@ -0,0 +1 @@
+out/
diff --git a/zynqmp-zcu102-wolfip/README.md b/zynqmp-zcu102-wolfip/README.md
new file mode 100644
index 0000000..c95dc62
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/README.md
@@ -0,0 +1,115 @@
+# wolfBoot + wolfIP on AMD/Xilinx ZynqMP (ZCU102)
+
+Secure boot of a bare-metal **wolfIP** TCP/IP application with **wolfBoot** on the ZCU102, booting from SD card. wolfBoot verifies the application's RSA-4096 / SHA3 signature before every boot, and the running application fetches a signed firmware update over the network and applies it to the SD card itself.
+
+## Boot chain
+
+```
+BootROM -> FSBL -> PMUFW -> BL31 (ATF, EL3) -> wolfBoot (EL2) -> wolfIP app (EL2)
+                                                   |
+                                                   +-- verify RSA-4096 / SHA3 signature, then load
+```
+
+`BOOT.BIN` (on the FAT boot partition) carries FSBL + PMUFW + BL31 + wolfBoot. The wolfIP application is a **separate signed image** on the `OFP_A` SD partition; wolfBoot authenticates it and loads it to DDR `0x10000000` (matching the app's `LAYOUT=ddr` link address), then hands off at EL2. The app runs DHCP, a UDP echo/control service, and the network update logic.
+
+## Prerequisites
+
+- **wolfBoot** - the `../wolfBoot` submodule: `git submodule update --init --recursive wolfBoot`
+- **wolfIP** - a sibling clone of [wolfSSL/wolfip](https://github.com/wolfSSL/wolfip) (the AMD/Xilinx ports + the ZCU102 OTA support): `git clone https://github.com/wolfSSL/wolfip ../../wolfip` (override with `WOLFIP=/path/to/wolfip`).
+- **FSBL / PMUFW / BL31** - build these for the ZCU102 yourself; they are board- and tool-specific. FSBL + PMUFW come from Vitis/PetaLinux for the ZCU102; BL31 from Arm Trusted Firmware (`make PLAT=zynqmp RESET_TO_BL31=1`). Put `zynqmp_fsbl.elf`, `pmufw.elf`, `bl31.elf` in one directory and pass `FW=/that/dir`.
+- **Toolchain + tools** - the `aarch64-none-elf-` (bare-metal newlib) GCC and `bootgen` (Vitis) on `PATH`.
+
+## Build
+
+```
+./build.sh
+```
+
+This builds wolfBoot for the ZynqMP SD config (`zynqmp_sdcard.config`, RSA-4096 / SHA3, generating a signing key), builds and signs the `EL=2 LAYOUT=ddr` wolfIP app at **both v1 and v2**, and assembles `out/BOOT.BIN`. Outputs:
+
+| File | Purpose |
+|------|---------|
+| `out/BOOT.BIN` | bootloader chain (FSBL+PMUFW+BL31+wolfBoot) |
+| `out/wolfip_app_v1_signed.bin` | the app signed v1 - goes to `OFP_A` |
+| `out/wolfip_app_v2_signed.bin` / `out/wolfip_update.bin` | signed v2 - the network update |
+
+## Program the SD card
+
+A stock PetaLinux ZCU102 SD card (MBR: boot / OFP_A / OFP_B / rootfs) works as-is. For a blank or repurposed card, create that layout first (this ERASES the disk):
+
+```
+SD=/dev/sdX ./partition-sd.sh
+```
+
+Then write the bootloader + app:
+
+```
+SD=/dev/sdX ./program-sd.sh
+```
+
+This copies `BOOT.BIN` into the FAT boot partition and `dd`s the signed v1 app to the raw `OFP_A` partition (needs root). Add `WIPE_OFP_B=1` to also clear `OFP_B` so the board boots `A:v1` fresh (handy for demoing the update). Then put the card in the ZCU102, set boot-mode `SW6 = SD`, and power on.
+
+## Run
+
+On the serial console (PS-UART0, 115200 8N1) you should see FSBL -> wolfBoot (which verifies the signature) -> the wolfIP banner, DHCP bind, and `Ready`. A modified or unsigned `OFP_A` image fails wolfBoot's check and is not booted.
+
+## Signed firmware update (over the network)
+
+The running app fetches a newer signed image over **TFTP**, writes it to the `OFP_B` SD partition, and resets. The config is version-selecting (`WOLFBOOT_NO_PARTITIONS=1`, "boot the higher version"), so no update flag is needed: wolfBoot verifies both `OFP_A` (v1) and `OFP_B` (v2), boots the higher version, and rolls back to `OFP_A` if `OFP_B` ever fails to verify.
+
+What makes this notable is *how* the app reaches the SD card: it re-uses **wolfBoot's own SD-host and disk drivers** (`$WOLFBOOT/src/sdhci.c`, `disk.c`, `gpt.c`) by compiling that same source straight into the application (the `OTA=1` path in the app `Makefile`), behind a small EL2 platform shim (`boards/zcu102/sdhci_shim.c`: register access, timer, SDMA cache maintenance). One driver, two consumers, no runtime hand-off.
+
+Run it once the app is at `Ready` (the app fetches from the sender's host, so run this on a machine on the board's subnet that has a TFTP server serving `TFTP_ROOT`):
+
+```
+BOARD_IP=<board-ip> ./update.sh
+```
+
+`update.sh` stages `out/wolfip_update.bin` into the TFTP root (default `/srv/tftp`, override `TFTP_ROOT=`) and sends the `UPDATE` trigger to the board's port 7.
+
+### Expected console
+
+```
+Versions, A:1 B:0
+Attempting boot from P:A
+Verifying image signature...done
+Firmware Valid.
+=== wolfIP ZCU102 (UltraScale+ A53-0 EL2) ===
+DHCP bound:
+  IP: 10.0.4.140
+Ready. Try: nc -u <leased-ip> 7
+
+UDP echo: 6 bytes from 10.0.4.24
+OTA: init SD card...
+OTA: SD ready, reading MBR...
+OTA: requesting 'wolfip_update.bin' from 10.0.4.24
+OTA: staging update to RAM
+......
+OTA: writing 110208 bytes to OFP_B (part 2)...
+OTA: update staged to OFP_B
+OTA: transfer complete - resetting to apply update      <- intentional reset, not a crash
+
+[board resets]
+Versions, A:1 B:2
+Attempting boot from P:B                                <- now boots the v2 update
+Verifying image signature...done
+Firmware Valid.
+```
+
+The reset after "update staged" is intentional - the app reboots so wolfBoot re-evaluates and picks the higher version. A tampered or unsigned download simply fails wolfBoot's signature check on the next boot and the board stays on v1.
+
+### Notes
+
+- **Security model** - the `UPDATE` trigger itself is unauthenticated, but every image is RSA-4096 / SHA3 verified by wolfBoot before it ever boots, so the trust boundary is the signature, not the trigger. The worst a rogue trigger can do is cause a download that wolfBoot then rejects.
+- **TFTP options** - the client uses 512-byte blocks and windowsize 1: the most compatible settings, which also keep large UDP bursts off the app's poll-driven receive path.
+
+## Layout
+
+| File | Purpose |
+|------|---------|
+| `build.sh` | Build wolfBoot + sign the app (v1 + v2) + assemble `BOOT.BIN` |
+| `program-sd.sh` | Write `BOOT.BIN` + signed app to an SD card (`WIPE_OFP_B=1` for a clean slate) |
+| `partition-sd.sh` | Create the demo MBR layout on a blank card |
+| `update.sh` | Stage the update image + trigger it over the network |
+| `boot.bif.in` | bootgen template (FSBL/PMUFW/BL31/wolfBoot) |
+| `out/` | Build output |
diff --git a/zynqmp-zcu102-wolfip/boot.bif.in b/zynqmp-zcu102-wolfip/boot.bif.in
new file mode 100644
index 0000000..42bb1b6
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/boot.bif.in
@@ -0,0 +1,11 @@
+// bootgen image for the ZCU102 wolfBoot + wolfIP demo.
+// FSBL -> PMUFW -> BL31 (EL3) -> wolfBoot (EL2). The signed wolfIP app is NOT
+// inside BOOT.BIN - it lives on the SD OFP_A partition and wolfBoot loads it.
+// @FW@ and @WOLFBOOT@ are substituted by build.sh.
+the_ROM_image:
+{
+	[bootloader, destination_cpu=a53-0] @FW@/zynqmp_fsbl.elf
+	[destination_cpu=pmu] @FW@/pmufw.elf
+	[destination_cpu=a53-0, exception_level=el-3, trustzone] @FW@/bl31.elf
+	[destination_cpu=a53-0, exception_level=el-2] @WOLFBOOT@/wolfboot.elf
+}
diff --git a/zynqmp-zcu102-wolfip/build.sh b/zynqmp-zcu102-wolfip/build.sh
new file mode 100755
index 0000000..9a99929
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/build.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+#
+# Build the ZCU102 wolfBoot + wolfIP secure-boot demo end to end:
+#   FSBL -> PMUFW -> BL31 (EL3) -> wolfBoot (EL2) -> signed wolfIP app (EL2).
+#
+# Produces, in out/:
+#   BOOT.BIN                  - bootloader chain (FSBL+PMUFW+BL31+wolfBoot)
+#   wolfip_app_v1_signed.bin  - the app signed v1 (programmed to OFP_A)
+#   wolfip_app_v2_signed.bin  - the same app signed v2 (the network update)
+#   wolfip_update.bin         - a copy of the v2 image (the name update.sh serves)
+#
+# Dependencies (see README.md):
+#   - wolfBoot: the ../wolfBoot submodule
+#               (git submodule update --init --recursive)
+#   - wolfIP:   a sibling clone of wolfSSL/wolfip (default ../../wolfip)
+#   - FSBL/PMUFW/BL31: build for the ZCU102 with Vitis/PetaLinux; point FW= at them
+#   - aarch64-none-elf toolchain and bootgen (Vitis) on PATH
+# Override any path with the matching env var.
+#
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+WOLFBOOT="${WOLFBOOT:-$HERE/../wolfBoot}"
+WOLFIP="${WOLFIP:-$HERE/../../wolfip}"
+FW="${FW:-$HOME/GitHub/soc-prebuilt-firmware/zcu102-zynqmp}"  # zynqmp_fsbl.elf, pmufw.elf, bl31.elf
+CROSS="${CROSS_COMPILE:-aarch64-none-elf-}"
+UPDATE_VERSION="${UPDATE_VERSION:-2}"
+MAC5="${MAC5:-0x33}"
+OUT="$HERE/out"
+APPDIR="$WOLFIP/src/port/amd/boards/zcu102"
+mkdir -p "$OUT"
+
+# Fail fast on missing dependencies (clearer than a build error halfway through).
+[ -d "$WOLFBOOT/src" ] || { echo "ERROR: wolfBoot not at $WOLFBOOT - run: git submodule update --init --recursive" >&2; exit 1; }
+[ -d "$APPDIR" ]       || { echo "ERROR: wolfIP port not at $APPDIR - clone wolfSSL/wolfip as a sibling or set WOLFIP=" >&2; exit 1; }
+[ -f "$FW/zynqmp_fsbl.elf" ] || { echo "ERROR: FSBL/PMUFW/BL31 not in $FW - build them (see README) and set FW=" >&2; exit 1; }
+
+echo "== 1/3  wolfBoot (ZynqMP SD, RSA4096/SHA3) =="
+cp "$WOLFBOOT/config/examples/zynqmp_sdcard.config" "$WOLFBOOT/.config"
+# Build inside $WOLFBOOT (its Makefile resolves the sign tool via $(PWD)). The
+# build generates the signing key, reused so a v2 update verifies against the
+# same wolfBoot. If a stale key with a different algorithm is present, run
+# 'make keysclean' in wolfBoot once.
+( cd "$WOLFBOOT" && make keytools >/dev/null )
+( cd "$WOLFBOOT" && make clean >/dev/null 2>&1 || true )
+( cd "$WOLFBOOT" && make CROSS_COMPILE="$CROSS" wolfboot.elf )
+cp "$WOLFBOOT/wolfboot.elf" "$OUT/"
+
+echo "== 2/3  wolfIP app (EL2, DDR, OTA) + sign v1 + v$UPDATE_VERSION =="
+# OTA=1 compiles wolfBoot's own SD/disk drivers ($WOLFBOOT/src/{sdhci,disk,gpt}.c)
+# straight into the app so the running image can fetch a signed update over TFTP
+# and stage it to OFP_B itself - no runtime hand-off from wolfBoot.
+make -C "$APPDIR" clean >/dev/null 2>&1 || true
+make -C "$APPDIR" CROSS_COMPILE="$CROSS" EL=2 LAYOUT=ddr OTA=1 WOLFBOOT="$WOLFBOOT" \
+    CFLAGS_EXTRA="-DWOLFIP_MAC_5=$MAC5"
+"${CROSS}objcopy" -O binary "$APPDIR/app.elf" "$OUT/wolfip_app.bin"
+# Sign the same image at v1 (boots from OFP_A) and at the update version (served
+# over the network). wolfBoot boots the higher version, so v1 updates to v2.
+KEY="$WOLFBOOT/wolfboot_signing_private_key.der"
+"$WOLFBOOT/tools/keytools/sign" --rsa4096 --sha3 "$OUT/wolfip_app.bin" "$KEY" 1
+"$WOLFBOOT/tools/keytools/sign" --rsa4096 --sha3 "$OUT/wolfip_app.bin" "$KEY" "$UPDATE_VERSION"
+cp "$OUT/wolfip_app_v${UPDATE_VERSION}_signed.bin" "$OUT/wolfip_update.bin"
+
+echo "== 3/3  BOOT.BIN (FSBL+PMUFW+BL31+wolfBoot) =="
+# Escape the replacement strings: '\', '&' and the '|' delimiter are special to
+# sed's RHS, so a path containing them would otherwise corrupt boot.bif.
+sed_escape() { printf '%s' "$1" | sed -e 's/[\\&|]/\\&/g'; }
+sed -e "s|@FW@|$(sed_escape "$FW")|g" \
+    -e "s|@WOLFBOOT@|$(sed_escape "$OUT")|g" \
+    "$HERE/boot.bif.in" > "$OUT/boot.bif"
+bootgen -arch zynqmp -image "$OUT/boot.bif" -w on -o "$OUT/BOOT.BIN"
+
+echo
+echo "Done. Artifacts in $OUT:"
+ls -la "$OUT"/BOOT.BIN "$OUT"/wolfip_app_v1_signed.bin "$OUT"/wolfip_update.bin
+echo "Next:  SD=/dev/sdX ./program-sd.sh      (writes BOOT.BIN + the v1 app)"
+echo "       boot ZCU102 (SW6=SD), then  BOARD_IP=<ip> ./update.sh   to update to v$UPDATE_VERSION"
diff --git a/zynqmp-zcu102-wolfip/partition-sd.sh b/zynqmp-zcu102-wolfip/partition-sd.sh
new file mode 100755
index 0000000..9e8ad95
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/partition-sd.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+#
+# Partition a BLANK SD card for the ZCU102 wolfBoot + wolfIP demo, matching the
+# zynqmp_sdcard.config MBR layout. A stock PetaLinux ZCU102 card already has
+# this layout - use this script only when starting from a blank/repurposed card:
+#   p1  boot   128M  FAT32, bootable  <- BOOT.BIN
+#   p2  OFP_A  200M  raw              <- signed app (primary)
+#   p3  OFP_B  200M  raw              <- update slot
+#   p4  rootfs rest  (unused by this bare-metal demo)
+#
+# DESTRUCTIVE: erases the entire target disk. Double-check with lsblk!
+#
+# Usage:  SD=/dev/sdX ./partition-sd.sh
+#
+set -euo pipefail
+
+SD="${SD:?set SD=/dev/sdX (your card reader - NOT a board, NOT your system disk!)}"
+[ -b "$SD" ] || { echo "$SD is not a block device" >&2; exit 1; }
+
+# Partition node suffix: /dev/sdX -> sdX1 ; /dev/mmcblkN|nvmeN|loopN -> ...p1
+case "$SD" in
+    *[0-9]) P="p" ;;
+    *)      P=""  ;;
+esac
+
+# Refuse if anything on the device is mounted.
+if lsblk -nro MOUNTPOINT "$SD" | grep -q .; then
+    echo "ERROR: $SD has mounted partitions - unmount them first:" >&2
+    lsblk -o NAME,SIZE,TYPE,MOUNTPOINT "$SD" >&2
+    exit 1
+fi
+
+echo "Target $SD:"; lsblk -o NAME,SIZE,TYPE,LABEL,FSTYPE "$SD"
+echo
+echo "This ERASES ALL DATA on $SD and writes the ZCU102 demo MBR layout."
+read -r -p "Type the device path ($SD) to confirm: " a
+[ "$a" = "$SD" ] || { echo "aborted"; exit 1; }
+
+echo "== writing MBR partition table =="
+# 1 MiB align; 128M boot (FAT32, bootable), 200M OFP_A, 200M OFP_B, rest rootfs.
+sudo sfdisk "$SD" <<'EOF'
+label: dos
+unit: sectors
+start=2048,  size=262144, type=c, bootable
+size=409600, type=83
+size=409600, type=83
+type=83
+EOF
+
+sudo partprobe "$SD" 2>/dev/null || true
+sync; sleep 1
+
+echo "== formatting ${SD}${P}1 as FAT32 (boot) =="
+sudo mkfs.vfat -F 32 -n BOOT "${SD}${P}1" >/dev/null
+
+sync
+echo "Done. $SD now has boot / OFP_A / OFP_B / rootfs."
+echo "Next: SD=$SD ./program-sd.sh"
diff --git a/zynqmp-zcu102-wolfip/program-sd.sh b/zynqmp-zcu102-wolfip/program-sd.sh
new file mode 100755
index 0000000..61713d1
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/program-sd.sh
@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+#
+# Program an SD card for the ZCU102 wolfBoot + wolfIP demo.
+#
+# Expects an MBR card laid out like zynqmp_sdcard.config (a stock PetaLinux
+# ZCU102 SD card works):
+#   p1  boot   FAT32, bootable   <- BOOT.BIN      (FSBL+PMUFW+BL31+wolfBoot)
+#   p2  OFP_A  raw               <- signed app    (wolfBoot's primary image)
+#   p3  OFP_B  raw               (update slot - written over the network at run time)
+#   p4  rootfs                   (unused by this bare-metal demo)
+#
+# wolfBoot reads the *raw* OFP_A partition (WOLFBOOT_NO_PARTITIONS, BOOT_PART_A=1),
+# so the signed image is dd'd to the start of p2 (this needs root). Copying
+# BOOT.BIN into the FAT p1 does not.
+#
+# Usage:  SD=/dev/sdX ./program-sd.sh         (X = your card reader, NOT a board)
+#         WIPE_OFP_B=1 SD=/dev/sdX ./program-sd.sh   also zero OFP_B so the board
+#                                     boots A:v1 fresh (for a clean A->B update demo)
+#
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+OUT="$HERE/out"
+VERSION="${VERSION:-1}"
+SIGNED="$OUT/wolfip_app_v${VERSION}_signed.bin"
+SD="${SD:?set SD=/dev/sdX (your SD card reader block device - double-check with lsblk!)}"
+
+[ -f "$OUT/BOOT.BIN" ] || { echo "missing $OUT/BOOT.BIN - run ./build.sh first" >&2; exit 1; }
+[ -f "$SIGNED" ]       || { echo "missing $SIGNED - run ./build.sh first" >&2; exit 1; }
+[ -b "$SD" ]           || { echo "$SD is not a block device" >&2; exit 1; }
+
+# Partition node suffix: /dev/sdX -> sdX1 ; /dev/mmcblkN|nvmeN|loopN -> ...p1
+case "$SD" in
+    *[0-9]) P="p" ;;
+    *)      P=""  ;;
+esac
+
+echo "Target $SD:"; lsblk -o NAME,SIZE,TYPE,LABEL,FSTYPE "$SD"
+read -r -p "Write BOOT.BIN to ${SD}${P}1 (FAT) and the signed app to ${SD}${P}2 (raw)? [y/N] " a
+[ "$a" = y ] || { echo "aborted"; exit 1; }
+
+echo "== BOOT.BIN -> ${SD}${P}1 (FAT boot partition) =="
+MNT="$(mktemp -d)"
+# Ensure the partition is unmounted and the temp dir removed even if a step
+# below fails under 'set -e' or the script is interrupted.
+trap 'sudo umount "$MNT" 2>/dev/null || true; rmdir "$MNT" 2>/dev/null || true' EXIT
+sudo mount "${SD}${P}1" "$MNT"
+sudo cp "$OUT/BOOT.BIN" "$MNT/BOOT.BIN"
+sync
+
+echo "== signed app -> ${SD}${P}2 (OFP_A, raw) =="
+sudo dd if="$SIGNED" of="${SD}${P}2" bs=1M conv=fsync status=progress
+
+# Clean slate: zero the start of OFP_B so wolfBoot sees no valid update there
+# (version 0) and boots A:v1, ready for a fresh A->B update demo.
+if [ "${WIPE_OFP_B:-0}" = 1 ]; then
+    echo "== wiping OFP_B header -> ${SD}${P}3 =="
+    sudo dd if=/dev/zero of="${SD}${P}3" bs=1M count=1 conv=fsync status=none
+fi
+
+sync
+echo "Done. Put the card in the ZCU102, set SW6=SD, and power on."
diff --git a/zynqmp-zcu102-wolfip/update.sh b/zynqmp-zcu102-wolfip/update.sh
new file mode 100755
index 0000000..71461ff
--- /dev/null
+++ b/zynqmp-zcu102-wolfip/update.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+#
+# Trigger the network firmware update for the ZCU102 wolfBoot + wolfIP demo.
+#
+# Stages the signed update image (out/wolfip_update.bin, from build.sh) into a
+# TFTP root, then sends the "UPDATE" trigger to the running app. The app fetches
+# the image from the *sender's* host over TFTP, writes it to OFP_B, and resets;
+# wolfBoot then verifies and boots the higher version.
+#
+# Assumes a TFTP server is already running on THIS host and serving $TFTP_ROOT
+# (e.g. tftpd-hpa at /srv/tftp), reachable from the board's subnet. (The app
+# fetches from the sender's IP, so the TFTP server must be on the machine that
+# runs this script.)
+#
+# Usage:  BOARD_IP=10.0.4.140 [TFTP_ROOT=/srv/tftp] ./update.sh
+#
+set -euo pipefail
+HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+BOARD_IP="${BOARD_IP:?set BOARD_IP=<the board IP shown on its console>}"
+TFTP_ROOT="${TFTP_ROOT:-/srv/tftp}"
+IMG="${IMG:-$HERE/out/wolfip_update.bin}"
+PORT="${PORT:-7}"   # the app's UDP echo/control port
+
+[ -f "$IMG" ]       || { echo "ERROR: $IMG not found - run ./build.sh first" >&2; exit 1; }
+[ -d "$TFTP_ROOT" ] || { echo "ERROR: TFTP_ROOT $TFTP_ROOT is not a directory - start a TFTP server or set TFTP_ROOT=" >&2; exit 1; }
+[ -w "$TFTP_ROOT" ] || { echo "ERROR: TFTP_ROOT $TFTP_ROOT not writable by $(id -un) - fix perms or set TFTP_ROOT= to a writable dir" >&2; exit 1; }
+command -v nc >/dev/null || { echo "ERROR: 'nc' (netcat) not found" >&2; exit 1; }
+
+echo "Staging $(basename "$IMG") -> $TFTP_ROOT/wolfip_update.bin"
+cp "$IMG" "$TFTP_ROOT/wolfip_update.bin"
+
+echo "Triggering update on $BOARD_IP:$PORT ..."
+printf 'UPDATE' | nc -u -w1 "$BOARD_IP" "$PORT"
+
+echo
+echo "Watch the board console: it fetches wolfip_update.bin over TFTP, writes"
+echo "OFP_B, resets (intentional), and wolfBoot then boots the higher version."