A warning message will appear on your screen. Use the volume keys to select "Yes" or "Unlock the bootloader" and press the power button to confirm 1.2.1 . Reboot System: fastboot reboot Use code with caution. Troubleshooting & Special Cases
Ensure all critical data is backed up to a cloud service or external storage. Enable Developer Options: Go to Settings > About Phone .
Connect the normal USB cable from the adapter to the target phone.
Or, on newer versions:
While traditional methods rely on a Windows or Linux PC, the Termux approach brings the terminal experience directly to your mobile device, making it a favorite for those without desktop access. Setup and Ease of Use unlock bootloader using termux link
Use your OTG cable/adapter to physically link the Host Device to the Target Device.
Download and install Termux from F-Droid or the official GitHub page. Note: Do not use the outdated version on the Google Play Store.
Ensure that power-saving mode is turned off for Termux on your host phone. Android's aggressive background battery optimization can put Termux to sleep mid-command, which risks interrupting critical flashing sequences. If you plan to proceed with this setup, let me know:
: You need a USB OTG adapter and a data cable to connect the two phones. Device Specifics : This guide is commonly used for Xiaomi/Poco A warning message will appear on your screen
: An unlocked bootloader allows for custom ROMs and root access but makes the device vulnerable to physical tampering. If the device is lost or stolen, a sophisticated attacker could theoretically bypass certain system protections.
Think of the bootloader as the security guard for your device's operating system. It's a low-level software that runs before the Android OS starts, telling the phone which system to load. Locking it ensures that the device will only boot trusted and official software.
Android isolates the OS from the bootloader environment for security.
adb devices
Unlocking the bootloader triggers a factory reset. Back up all photos, contacts, and personal data.
| Method | Requires PC? | Works on Locked Device? | |--------|--------------|--------------------------| | Official OEM unlock (fastboot) | Yes | No (needs fastboot mode) | | Exploit (e.g., mtk-su, CVE) | Sometimes | Rarely (needs vulnerable kernel) | | Engineering bootloader pre-flashed | No | No (already unlocked) |
Unlocking your bootloader using Termux typically involves using one Android device to unlock another via a USB OTG cable. This process allows you to run ADB and Fastboot commands directly from your mobile terminal without a PC.
Connect the two phones using the USB OTG cable. The host phone (with Termux) should be connected to the "USB-A" side of the adapter, and the target phone should be connected to the "USB-C/Micro" side. Troubleshooting & Special Cases Ensure all critical data
Use Termux to force the target device to reboot into its bootloader loader environment: adb reboot bootloader Use code with caution.