Plug the into the host phone (the one running Termux). Connect the standard USB data cable to the OTG adapter. Plug the other end of the data cable into the target phone .
This process may void your manufacturer's warranty.
Unlocking the bootloader allows you to:
Force the target phone into its bootloader menu by executing: adb reboot bootloader Use code with caution.
Follow these steps carefully to install the necessary tools inside Termux on the Host Device (Device A) and execute the unlock commands on the Target Device (Device B). Step 1: Install Termux and Initialize Packages unlock bootloader using termux link
Unlock Bootloader of any Device using PC or Android. - GitHub
The phone whose bootloader you want to unlock. Hardware Required: Plug the into the host phone (the one running Termux)
What (if any) is displaying in your Termux terminal?
If you are attempting to unlock using another phone (using USB OTG), connect them now. If using only one phone (rooted), the command will work directly on the device. This process may void your manufacturer's warranty