# EEPROM was written, but validation failed. Check your settings.

_Help · started by j on Thu, Aug 13, 2026 12:13 PM_

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## Original post

**j** · Thu, Aug 13, 2026 12:13 PM

Hey there, trying to rnodeconf a RAK4631 to tinker with it as a transport node. 

It had worked before, but found the device with a blinking green LED which seemed bad (maybe its battery got empty or something...?) so i decided to re-flash it, double-pressed reset.. and i tried the following:

`
$ rnodeconf --autoinstall --fw-url https://github.com/attermann/microReticulum_Firmware/releases/ 
`

answers the questions right, and things seem to go well up to the last step:

#########################
Activating new firmware
Device programmed.
[14:06:36] Done flashing
[14:06:36] Waiting for NRF52 reset...
[14:06:42] Opening serial port /dev/ttyACM1...
[14:06:45] Device connected
[14:06:45] Current firmware version: 1.86
[14:06:45] Reading EEPROM...
[14:06:46] Clearing old EEPROM, this will take about 15 seconds...
[14:07:09] Waiting for NRF52 reset...
[14:07:27] Loading signing key...
[14:07:27] Bootstrapping device EEPROM...
[14:07:31] EEPROM written! Validating...
[14:07:32] Setting firmware checksum...
[14:07:34] Waiting for NRF52 reset...
[14:07:55] EEPROM was written, but validation failed. Check your settings.

can anyone tell me what it means? and what to do? unsure i undestand the difference between firmware and EEPROM... can anyone point to relevant doc?

thanks!

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## Reply 1

**j** · Thu, Aug 13, 2026 1:00 PM

after that if i try:
`
rnodeconf --tnc --freq 869475000 --bw 125000 --sf 7 --cr 5 --txp 19  /dev/ttyACM1`


I get:

[14:24:18] Opening serial port /dev/ttyACM1...
[14:24:21] Device connected
[14:24:21] Current firmware version: 1.86
[14:24:21] Reading EEPROM...
[14:24:22] This device contains a valid firmware, but EEPROM is invalid.
[14:24:22] Probably the device has not been initialised, or the EEPROM has been erased.
[14:24:22] Please correctly initialise the device and try again!

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## Reply 2

**A. Non** · Thu, Aug 13, 2026 11:58 PM

Try the online flasher: https://liamcottle.github.io/rnode-flasher/

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