OnePlus 8 only booting in Bootloader after flashing ROM

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Apr 30, 2018
My OnePlus 8 T-Mo is only turning on in bootloader after flashing custom ROM. I don't think my device is bricked though. There's no bootloop or hard brick. Whatever I do I can't go to twrp. I tried to format cache from fastboot and I'm getting this error

FAILED (remote: Getvar variable not found)​

Fastboot error: command failed

I have no idea if this is a PC problem or my phone is actually bricked.