One month ago i bought a Redmi note 8 pro, when it comes after a long time (almost 3 weeks) it comes with bootloader opened so i couldn use for example NFC pay. I looked for information to lock the bootloader i followed steps and bootloader was closed but phone was bricked too, so only can put smarthphone in fastboot or in recovery mode. I tried flash some roms by Fastboot using CMD in pc but appears this message
C:\adb>fastboot flash system system.img
target reported max download size of 134217728 bytes
FAILED (remote: not allowed in locked state)
finished. total time: 0.004s
that was expected because bootloader is closed, but now i dont know if its posible to unlock bootloader and flash a new rom or beeing bootloader closed, flash a new rom for unbrick the phone.
To solve this problem I heard something abou autoriced xiaomi accounts and something about waiting seven days for unlock but i dont know nothing about it.
Thank you guys.