I recently swapped my AM Logic board for a Xilinx board (C55) and nothing worked. After some troubleshooting I found out it was running on X17 firmware. So I flashed the correct firmware on it with the sd card and updated it via the stock UI. Now the machine starts hashing again when on stock firmware, but the point of swapping the AM Logic board was to use Braiins or Asic.to to overclock it.
None of these work, Asic.to refuses to even boot, the fans ramp up and down in an oscillating way like some sort of alarm. Braiins OS+ works, I can log in and configure a pool and everything but none of the hashing boards are detected. Furthermore it seems that it thinks it's a X17, not a S19J Pro (even though the stock firmware from Bitmain recognises it as a S19J Pro).
I presume the autodetection from BraiinsOS detects something different so that it thinks it's an X17 board, even though I updated it and it's working when using stock firmware.
I ssh into the miner and edited the /etc/bosminer.toml file to include [model_detection]
use_config_fallback = true
and changed the model to Antminer S19J Pro as described here:
https://docs.braiins.com/os/plus-en/Configuration/index_configuration.html#model-detectionDoes anyone have any advice?
You can find the system log here:
https://pastebin.com/DzE4i24rThe reddit post with some images:
https://www.reddit.com/r/BitcoinMining/comments/wiidkf/braiins_os_nor_asicto_working_on_s19j_pro/?utm_source=share&utm_medium=web2x&context=3 
When reflashing the firmware, do you risk damaging the hashboard, because it is working, just not with Braiins os.