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The **Roland xx looks like a boot banner and is called differently in the firmware. I'm sure that's why it has different start and stop markers. Ditto for the early Version string. Interestingly, the early Version is way at the other end of the addresses in the code. This adds to the DFU / Bank swap theory.
When I finally load the firmware (I still haven't at this point) I spend ages looking for what calls these strings. I find it difficult to navigate but fascinating. It is difficult to navigate any production firmware disassembly I expect. I have no prior experience, but it seems the H8300H is kind of a different level, a bit of an oddity. It's used a lot in Japanese electronics. It is in a lot of Roland devices. Apparently it interleaves code and data frequently which makes static disassembly trickier. I have studied the datasheet for the CPU, and found out the boot modes, not so much what pins are active in Europe I thinkwhich boot mode, timer set up, SCI (serial) interface. I think it's Most pins of the CPU are mapped in the Gameboy Advance? excel sheet above and the notes belowe.
One or two strings can be discovered, which have a different call system to the diagnostic strings (the ones I'm most interested in) especially because I have to repair so many subsystems, ICs, and traces.