For most CV628H boards, the service menu can be accessed by pressing Menu + 1147 on the remote.

Some communities suggest using Telegram to find specific board files. The Dip Electronics Lab site provides a table that directs users to search for the board number within their Telegram community . Installation Notes Verify Board Number: Ensure your board exactly matches CV628H-B42 to avoid bricking the device.

LED Softwares offers a paid or premium version of this firmware.