Typical on-device Termux approach (high-level):
Warning: This wipes all data on Phone A. unlock bootloader via termux
You cannot unlock your own bootloader using Termux on the same device without a second device or a USB hub. You need a second device (a PC or another Android phone) to send the fastboot oem unlock command via USB. However, Termux can act as the host for that second device. However, Termux can act as the host for that second device
Connect the target device to the host device using the OTG adapter. Ensure the target device is in Fastboot Mode (usually by holding Power + Volume Down during boot). Establish Connection Verify the host recognizes the target device by typing: fastboot devices Use code with caution. Copied to clipboard If successful, you will see a serial number. Execute Unlock Command Establish Connection Verify the host recognizes the target
In the world of Android customization, unlocking the bootloader is the "holy grail." It is the first step toward rooting, installing custom ROMs (like LineageOS or Pixel Experience), flashing custom kernels, and gaining complete administrative control over your device. Traditionally, this process involves a PC, a USB cable, and command-line tools like fastboot .