I swapped the emmc, it works now. I had full backups of the old original emmc, that is RAW GPP and BOOT0/1, as well as prod keys. I'm hoping just restoring them will work and won't get me banned. I never dumped the bis keys so I hope I didn't...
I'm getting an endless pulsating blue light, eventually it stops working. Could it be bad emmc? I can't boot on stock either, wanted to use the chip to diagnose.