Connect the phone to a PC and use the command adb reboot bootloader .

Connect it to your computer using a high-quality USB cable while holding down the and Power buttons simultaneously.

Flash your downloaded custom recovery image with the command: fastboot flash recovery recovery.img

Official custom ROM support for the (model TA-1336/TA-1365) is virtually non-existent due to significant hardware and software limitations. Current Status of Custom ROMs Locked Bootloader

Camera and multimedia

Because the Nokia G20 utilizes dynamic partitions, you must flash the GSI using rather than standard Fastboot mode. Step 1: Download the Correct GSI File

Flashing a GSI is done via Fastboot, a protocol used to flash files onto Android devices. Here's a general guide:

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Ensure your Nokia G20 is charged to at least 60–80%. A dead battery mid-flash can brick your device.

Once your new ROM is running, perform a quick check to ensure everything works properly:

Use the tool's interface or command line to execute the bootloader unlock command ( python mtk e metadata,userdata followed by the unlock sequence commands specific to the tool version).

Make sure you have the official Google USB drivers, ADB , and Fastboot installed on your PC. Step-by-Step: How to Flash a GSI ROM

The path involves navigating a challenging bootloader unlock with tools like MTK Client , forgoing a traditional custom recovery for now, and directly flashing a GSI via fastboot.