K2001N NWD is a common firmware designation for generic aftermarket Android car head units , specifically those powered by the Allwinner T3 Quad-Core
Go to Settings > About Tablet and tap "Build Number" 7 times. Then go to Developer Options and set:
Introduction
The K2001N is a compact network/embedded device (often encountered in consumer networking kits and niche industrial setups). “NWD firmware 2021” refers to a firmware build released in 2021 aiming to update low-level software: networking stacks, device drivers, security patches, and various hardware-management routines. Unlike flashy firmware for phones, this was the kind of behind-the-scenes code that quietly decides whether your device plays nice with the rest of your network.