Ken According to the official CEC README, it recommends referring directly to the upstream manual. https://github.com/egzumer/uv-k5-firmware-custom/wiki However, during version updates, some operations are also changing, as documented on CEC's blog for each version release page: http://www.hamskey.com/2024/04/introduction-to-uv-k5-hf-05-fullband.html You can download it from here within China: pan.baidu.com/s/1pPOwHZWpA90TIymejzraDw Extraction code: kbnn