diff --git a/.gitignore b/.gitignore
index 8635655..16c2958 100644
--- a/.gitignore
+++ b/.gitignore
@@ -47,3 +47,5 @@ libftdi1*.bz2
 libusb*/
 hidapi*/
 .idea/*
+
+/reloader/
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..25600a7
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "reloader"]
+	path = reloader
+	url = git@github.com:daniel-thompson/wasp-reloader.git
diff --git a/README.md b/README.md
index c36d988..b82b0c0 100644
--- a/README.md
+++ b/README.md
@@ -68,8 +68,9 @@ The goal of this firmware is to provide a mean for the user to OTA a new firmwar
 
 - Install `newt` tool
 - Clone the project and `cd` into it
+- Init and update submodules : `git submodule update --init --recursive`
 - Configure mynewt : `newt upgrade`
-- Build : `scripts/nrf52/build-boot.sh`. The firmware is generated in `bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf`
+- Build : `scripts/nrf52/build-boot.sh`. The firmware is generated in `bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf` and the DFU file for the reloader : `reloader/build-pinetime/reloader-mcuboot.zip`
 
 ## About the code
 
diff --git a/scripts/hex2c.py b/scripts/hex2c.py
new file mode 100755
index 0000000..74f8431
--- /dev/null
+++ b/scripts/hex2c.py
@@ -0,0 +1,50 @@
+#!/usr/bin/env python3
+
+# SPDX-License-Identifier: LGPL-3.0-or-later
+# Copyright (C) 2020 Daniel Thompson
+
+import binascii
+import intelhex
+import sys
+
+def generate_c(ihex):
+    print('/* this file is auto-generated - DO NOT EDIT */')
+    print()
+    print('#include <stdint.h>')
+    print()
+    print('struct segment {')
+    print('    uint32_t start;');
+    print('    uint32_t end;');
+    print('    uint32_t crc32;')
+    print('    const uint8_t *data;')
+    print('};')
+    print()
+
+    segments = []
+    chunk = 32 * 1024
+    for (start, end) in ihex.segments():
+        while start + chunk < end:
+            segments.append((start, start + chunk))
+            start += chunk
+        if start < end:
+            segments.append((start, end))
+
+    for i, segment in enumerate(segments):
+        print(f'static const uint8_t segment{i}[] = {{', end='')
+
+        for j in range(segment[0], segment[1]):
+            if 0 == j % 12:
+                print('\n   ', end='')
+            print(f' 0x{ihex[j]:02x},', end='')
+
+        print('\n};\n')
+    print(f'const struct segment segments[] = {{')
+    for i, segment in enumerate(segments):
+        sg = ihex.tobinarray(start=segment[0], end=segment[1]-1)
+        crc = binascii.crc32(sg)
+        print(f'    0x{segment[0]:08x}, 0x{segment[1]:08x}, 0x{crc:08x}, segment{i},')
+    print('};')
+
+ihex = intelhex.IntelHex()
+ihex.loadhex(sys.argv[1])
+generate_c(ihex)
diff --git a/scripts/nrf52/build-boot.sh b/scripts/nrf52/build-boot.sh
index 5922623..fef67e0 100755
--- a/scripts/nrf52/build-boot.sh
+++ b/scripts/nrf52/build-boot.sh
@@ -13,6 +13,12 @@ newt build nrf52_boot
 #  Show the size.
 newt size -v nrf52_boot
 
-#  Copy the disassembler and linker map to the logs folder. For Stub Bootloader, select "bin/targets/nrf52_boot/app/apps/boot_stub/boot_stub.elf.*"
-cp bin/targets/nrf52_boot/app/boot/mynewt/mynewt.elf.lst logs
-cp bin/targets/nrf52_boot/app/boot/mynewt/mynewt.elf.map logs
+arm-none-eabi-objcopy -I binary -O ihex bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf.bin bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf.hex
+scripts/hex2c.py bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf.hex > reloader/src/boards/pinetime/bootloader.h
+make -C reloader BOARD=pinetime
+
+set +x
+echo "Bootloader firmware (elf) : bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.elf"
+echo "Bootloader firmware (bin) : bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.bin"
+echo "Bootloader firmware (hex) : bin/targets/nrf52_boot/app/@mcuboot/boot/mynewt/mynewt.hex"
+echo "Reloader (DFU) : reloader/build-pinetime/reloader-mcuboot.zip"