Good news on
@werinshades got a programming file that works, including the band plan - the StarComm one he used is pretty standard for a 700 / 800 Motorola P25 system, excepting the entries for the 450 MHz UHF band - a local mod.
For P25 systems, the SDS *should* download the band plan from the control channel stream. On my SDS radios, I have never entered band plan info for P25 systems. I looked in Sentinel, and the band plan data for my systems are set to all zeros, so the radio must be downloading the data automatically. Perhaps if someone entered band plan info that is not all zeros, the radio assumes it is a custom band plan and ignores what is coming from the control channel?? IDK.