Turn ignition to ACC. The unit will automatically detect the update.img file on the SD card and prompt: "System update detected. Install?" Use the volume knob or touchscreen to select Yes .

K2001N NWD is a common motherboard platform for budget Allwinner T3 Quad-Core

Use a translator. Go to the "Car Audio" section. The community is very active and maintains a firmware repository.

: Always verify your unit's version in Settings > About before flashing. Installing firmware for a different model (like the K2001Q) can permanently brick the device.

If you want, I can: