I have run into an issue while attempting to flash back to TurrisOS, and that is my Omnia won’t boot. It is the older model (non-2019). I have been able to go back to openWRT, but unable to have WIFI working, even after numerous reinstalls of firmware. My end result is to go back to TurrisOS.
I am currently waiting for my new TTL Cable to come in, as I could not locate my current one. I did have a similar issue a few years back, but I am unable to find the thread that gives the instructions on how to return to TurrisOS.