# Bootloader Flashing Error - Nordic USB Dongle

**URL:** <https://forum.makecode.com/t/bootloader-flashing-error-nordic-usb-dongle/2249>\
**Category:** Adafruit Circuit Playground Express\
**Created:** [May 28, 2020, 6:05pm UTC](https://forum.makecode.com/t/bootloader-flashing-error-nordic-usb-dongle/2249 "2020-05-28T18:05:19Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![ashok](https://avatars.discourse-cdn.com/v4/letter/a/ed655f/32.png) [@ashok](https://forum.makecode.com/u/ashok)\
**Post date:** [May 28, 2020, 6:05pm UTC](https://forum.makecode.com/t/bootloader-flashing-error-nordic-usb-dongle/2249/1 "2020-05-28T18:05:19Z")

</div>

H Team,

Im trying to flash the pre boot-loader from here

> **[adafruit/Adafruit\_nRF52\_Bootloader](https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases)**
>
> USB-enabled bootloaders for the nRF52 BLE SoC chips - adafruit/Adafruit\_nRF52\_Bootloader

  
for my nordic usb dongle.  
hex-\> mdk\_nrf52840\_dongle\_bootloader-0.3.2\_s140\_6.1.1.hex  
Im getting the DFU error.  
DFU failed: Error message for known extended error code from DFU target: The init packet does not contain a signature. This bootloader requires DFU updates to be signed.

Please help on this.  
Ashok R

---

<div class="post-metadata">

**Author:** ![peli](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.makecode.com/peli/32/12_2.png) [@peli](https://forum.makecode.com/u/peli)\
**Post date:** [May 29, 2020, 3:27pm UTC](https://forum.makecode.com/t/bootloader-flashing-error-nordic-usb-dongle/2249/2 "2020-05-29T15:27:38Z")

</div>

I would suggest to ask this on Adafruit discord.