Stuck in fastboot after EU rom update

[Aung Kyaw Minn]

My phone is stuck in fastboot screen. I can't do anything. Whatever I do, it still goes to fastboot mode. I can't fastboot from pc also. It shows Failed to load/authenticate boot.img: load error.
Before that my phone is already in custom rom and I wanted to update to MIUI EU rom, So I use EU recovery rom to update via TWRP. Early reboot stuck at MIUI logo and after that I tried to reboot again anda gain. Now it stuck only in fastboot screen. Please help.

 

[Poney70]

You said "my phone is already in custom rom and I wanted to update to MIUI EU rom" => More details about your previous ROM? (Xiaomi.eu ROM? ROM's version?)

Try to flash an Official "fastboot" ROM for your device (oh and what device?) via Mi Flash tool. If your device still can't boot normally then => https://xiaomi.eu/community/threads/mi-11-ultra-stuck-with-only-fastboot.62728/post-623968