I guess you are the resident insulter and jackass when someone asks a question? I see your snide comments all over this forum. Your type should normally just sit and watch but it never happens 'cuz you just have to get your jollies. You just LOVE talking down at someone new to gmrs when a question is asked.
I bought the RT Systems software [far superior to the free download CPS from Radiodity] and found out that the DB40-G manual is full of crap. Darn near everything is programmable. And YES, I got into ham radio from back when CB was 23 channels, there was a 5 and 5 rule, and the radios were crystal controlled (early 1960's). My first cb was a Heathkit GW-22 five channel crystal rig. I went in the navy and when I got out, an old cb buddy had gone ham so he gave me the novice test in 1972. That got my foot in the door of ham radio. I have held NOVICE, TECH, GENERAL, ADVANCED, and now EXTRA. I am still licensed and know morse code (Extra Class) 53 years later. I still have my old 23 channel Citifone SS mobile and base rigs (gathering dust in the closet).
I just got interested in GMRS because our local Skywarn group started using GMRS as an alternate method to check in to the weather watch nets along with 2m/70cm.
PS: I doubt any of this will put a civil tongue in you but one can hope.
PPS: Radiodity does supply a "driver" for their CPS but it made no difference. I now have my radio programmed for several local repeaters.
PPPS: I bought a nanoVNA so I could build my gmrs j-pole antenna and get it tuned without a lot of rigamarole. I didn't have to put up with your type while building it either.