Seems like my opi3 board have died. I was testing boards operation whit powerbank (https://www.mi.com/global/20000mah-redmi-18w-fast-charge-power-bank/) and after I ran stress test (stress --cpu 4 --io 4 --vm 4 --timeout 60s) to test if there is issues whit power delivery, board just turned off and I cant turn it back on. Board was powered on OTG port.
I contacted Xunlong and board seems to be dead, they have no suggestion what else I can do. Ok, ill have accepted that, but my question is, why did it happened? My theory is that powerbank, for some reason, provided 9v or 12v, so that burned the board. But why? It was opi fault, or powerbanks fault? Maybe armbian issue?