While holding the button, connect the device to your PC using the USB cable. Release the button after 3 to 5 seconds. Step 3: Flash the Firmware via RKBatchTool Launch on your PC.

The RK3188 was used in many devices. Before flashing, you must know which specific device you have:

Download the specific verified for your device model. Open Rockchip Batch Tool .

Most Android 5.1 firmware for RK3188-based hardware follows these standard configurations:

(a quad-core Cortex-A9 processor) primarily launched with Android 4.2 or 4.4. While official Android 5.1 Lollipop firmware exists for certain specific devices, it is generally considered the "upper limit" for this aging hardware.