Fastboot Error Failed To Boot Into Userspace Fastboot One Or More Components Might Be — Unbootable

(example):

fastboot flash boot boot.img fastboot flash dtbo dtbo.img fastboot flash vendor_boot vendor_boot.img fastboot flash super super.img # If super.img is sparse Or use the device’s flash-all script (after removing -w if you want to keep data). Erase and recreate super metadata: (example): fastboot flash boot boot

If you post the and what you flashed before the error , I can give you the exact partition layout and commands. (example): fastboot flash boot boot