working only aprs firmware

[tyto1ppp]

After test firmware from https://github.com/cfr34k/t-echo-lora-aprs
file: t-echo-lora-aprs-with-sd-v1.2.uf2
my t-echo don't working with meshtastic firmware. After sending file: firmware-t-echo-2.6.11.60ec05e.uf2 to device, lighting only left red LED.
what wrong?
Now, working ok only aprs firmware.
help me please!

[lewisxhe]

The firmware will break meshtastic compatibility. As long as t-echo-lora-aprs-with-sd-v1.2.uf2 is written, and then firmware-t-echo-inkhud-2.7.2.f6d3782.uf2 is written, the device will not run meshtastic firmware. The nRF52840 flash must be erased again, and then the LilyGo pre-installed bootloader must be re-flashed.

You must have Jlink or other tools that can flash nRF, and re-write the LilyGo factory pre-installed bootloader to write meshtastic. I have tested this many times just now.

cfr34k/t-echo-lora-aprs#30

[cfr34k]

Hi @tyto1ppp , after some testing we found two possible recovery procedures that work without re-flashing the bootloader. The cause for Meshtastic not booting seems to be that they use a different SoftDevice (the Bluetooth stack) version than my firmware and they don't include that in their images.

The first option is to flash a backup of CURRENT.UF2 from a working device (see also cfr34k/t-echo-lora-aprs#7 (comment) ).

The second option is to flash the SoftDevice required by Meshtastic separately before flashing Meshtastic itself. See cfr34k/t-echo-lora-aprs#30 (comment) for the details.

There is of course the third option of clearing the whole flash and re-flashing the bootloader using an SWD debugger, but that is not necessary here as far as I can see.

I hope you can restore your device using one of these procedures.

[tyto1ppp]

Very Thanks.... new bootloader helped. I used Arduino IDE with nrf libraries, and only USB Cable.