Power on massage field is grey'd out for Btech UV-5X3 so cannot set message. No error messages. All other features to  upload programing to this radio work !  I can activate the power on message via the radio menu but it reverts back to no message after uploading from CHIRP.  I tested this same daily build to activate the power on message on a  BF-F8HP, BF-F8+III  as well as a Yaesu FT2900, all worked without issue?

Radio firmware is  in the 2nd graphic below

Third graphic below, for reference,  is BF-F8HP showing active power on message field