While the target phone is connected, boot it into fastboot mode (usually by holding Volume Down + Power ). Alternatively, you can run adb reboot bootloader from Termux if ADB debugging is already enabled.
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Once the Target device is in Fastboot mode (often indicated by a "Fastboot" logo or text on its screen), verify the connection in Termux: fastboot devices Use code with caution.
Ensure you have the unlock code if your brand (like Sony or Xiaomi) requires one. Step 1: Install Termux and Tools unlock bootloader via termux
Disclaimer: Modifying your device may violate terms of service, cause data loss, or render the device inoperable. The author assumes no liability. Always verify commands and backup data before proceeding.
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Some manufacturers (like Xiaomi) require a specific Mi Unlock tool or a waiting period, even when using fastboot commands. While the target phone is connected, boot it
Termux does not include adb or fastboot by default. You need to install a package repository that contains these tools compiled for ARM architecture.
Modern Samsung devices do not use Fastboot mode; they use "Download Mode" and a desktop software tool called Odin. You cannot unlock a Samsung phone using Termux fastboot tools. Conclusion
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Look at the screen of the . Modern Android devices require physical confirmation to prevent accidental unlocking.
An Android phone with Termux installed. This device must support USB OTG (On-The-Go). The Target Device: The phone you wish to unlock. USB OTG Adapter: To connect the two phones.
Do not download Termux from the Google Play Store, as that version is deprecated and no longer receives package updates. Once the Target device is in Fastboot mode