Adding OpenWrt support for tp-link Archer AX55 Pro V2 (US) (MT7981B, 2.5GE x2)

For Developers
3

You can find some things without opening the device.
Firmware encrypted...
Search GPL sources from OEM if any
try this TP Link firmware decryption
Then binwalk (-eM) to find DTB file, chop it out with dd
Then use dtc to convert it to dts.