root@lifebook-PC:/home/lifebook/Desktop# fastboot boot twrp-mi8se.img
downloading 'boot.img'...
OKAY [ 1.244s]
booting...
FAILED (remote: Failed to load/authenticate boot image: Load Error)
finished. total time: 1.294s
Propably my bootloader is locked again :/
What can i do now? Any ideas...