I found 2 versions of fastboot. 10.3.11 and 10.3.6.0
the first one gives antri roll back error.
the second one goes through at miflash. But it's stuck at 99.99% as you said.
After booting into twrp no partion works either.
failed to mount /cache (I/O error)
same for cache and persists.
And than if it tries to mount data it says invalid argument
Currently trying to format data via twrp but it's stuck with those errors for about 1 hour. It is still moving but everything it's trying to restore is an invalid argument.