tried 115200 8n1 to serial console on usbc port . it is detected as a cp2104 usb to uart bridge with serial app i use to program network switches .
video of unit with flashing lte and faintly flashing power led . no other lights . tried several cables and plugging into macbook . also tried usb power adapter . it is drawing some power , but no wifi or console output . video of board
wifi is not booting i can not log in it's stuck at the screen that i posted
Again, until you solve the serial noise you are just wasting everyone's time - especially your own.
Without clean output you cannot determine what the actual stopping state is. The only clean output you posted was from a different device, not the problem device, so it is meaningless. Don't assume that power and serial solutions that work on one will work on the other, as you are in the domain of edge cases.
Without clean input you can't even know if there is an actual problem, or if noise inputs are being interpreted as a user request to halt the bootup and remain in u-boot.
Might want to be careful about that - unless there's level translation circuitry in there, you are putting substantial stress on the MT7688 serial pins (input especially) by connecting that 3.3v device to a 5v Arduino.
This is one of the issues I have with the Omega2 as against the Omega1. The Omega1 runs on the same 3.3v but the IO pins were explicitly stated to be 5v tolerant. They play well with Arduino and Arduino shields running on 5v.
I even produced an Arduino Expansion board that plugs in to the Expansion Dock and provides direct access from the Omega1 to Arduinos and Arduino shields (see https://github.com/KitBishop/Omega-Arduino-Expansion)
I am probably going to have to redo this to incorporate some level shifters to accommodate the Omega2 3.3v only.