Verify that the host terminal can still communicate with the device in this state: fastboot devices Use code with caution.
Enable (If this option is grayed out or missing, your device might have a permanently locked bootloader by the carrier).
Any functioning Android phone capable of running the latest version of Termux.
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Once the device is detected, you can send the unlock command. Depending on the manufacturer of your target device, the command will vary: fastboot flashing unlock Use code with caution. For Older Android Devices: fastboot oem unlock Use code with caution. Step 5: Confirm on the Target Device
This comprehensive guide breaks down how this process works, the technical limitations, and a step-by-step tutorial on how to use a two-phone Termux setup to unlock a bootloader. The Core Concept: The Two-Phone Setup
Once the process finishes (it takes 2-10 seconds), reboot your unlocked device: Verify that the host terminal can still communicate
From Termux, command the target phone to reboot into its bootloader environment: adb reboot bootloader Use code with caution.
On the Termux terminal of the Host phone, check if the target phone is recognized: adb devices Use code with caution.
Check the box for Always allow from this computer and tap . I can provide the or codes needed for your brand
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Phone A will factory reset and boot up with an unlocked bootloader. You will see a warning screen about the bootloader being unlocked every time you restart.
Do not download Termux from the Google Play Store, as that version is deprecated and no longer receives package updates.
Unlocking the bootloader triggers a mandatory factory reset. Back up all photos, contacts, and files.
Unlocking an Android bootloader via Termux is an elegant, computer-free solution for enthusiasts who own a spare device and an OTG cable. By transforming a secondary phone into an ADB/Fastboot terminal server, you can bypass the traditional desktop setup. Ensure your target device supports standard fastboot protocols, back up your critical data, and carefully verify your connection steps to successfully open your device up to custom ROMs and root access.