If you have a dat0 adapter, maybe you can use it to check your own dat0 line. connect it(but don't solder it) and check for continuity between the adapter and the end of your dat0 line, at the picofly joint. would that be possible? I am not familiar with dat0 reballs100% but my one starts!? OFW works no problem. Disconnected pico and boots into ofw. so must be a line that haven't soldered well. ill have to go back and see but im sure its the cmd line. might be bad solder joint even though it gives a good reading. very tricky. or emmc line wire not being hit to the correct dat0 point. maybe could have shifted to the dat1 point. Doubt it but don't want to go straight to that if i can help it. Do the small checks first and if all fails, back to reball again