Suggested actions:
: You can try contacting your original carrier. While rare, if the device is fully paid off, they might occasionally have a process to authorize an unlock, though this usually refers to SIM unlocking rather than the bootloader. Sailfish OS Forum Bootloader Unlock: NO - General - Sailfish OS Forum bootloader unlock allowed no to yes
Assuming you do not have a permanently locked carrier device, here are the proven techniques to change the flag. Suggested actions: : You can try contacting your
Requires the Mi Unlock Tool. You often need to bind your Mi account in Developer Options and wait for a specific period (sometimes 360-720 hours). Requires the Mi Unlock Tool
Most manufacturers explicitly state that unlocking the bootloader voids your device warranty. Sony's official guidance warns: "This may void your warranty and/or any warranty from your operator". Xiaomi's unlocking process comes with similar warranty implications.