Unlocking your bootloader using is a highly effective "PC-less" alternative for Android power users. This method typically involves using a secondary Android device as the "host" to send fastboot commands to the target device via an OTG adapter Review: Unlocking Bootloader via Termux
If you cannot make the "Termux link" method work, consider these: unlock bootloader using termux link
You can run fastboot oem unlock in Termux on your phone and instantly unlock it. Unlocking your bootloader using is a highly effective