Hi Sean – as you observe, the H8000 family are now discontinued, but we will do our best to support them.
1) The “dump setup” command essentially dumps the whole of the Non-Volatile RAM, which contains system and preset variables. As some of its contents change with time, it is not surprising that you notice small differences between dumps. As long as the dump can be reloaded, these are not a problem, or surprising. What they are, who knows.
2) This is probably a 25 year old bug, unreported until now. The RAM checksum is stored in the RAM, so when the RAM is reloaded it is corrupted. It should be restored after the reload, but alas is not. You only get the message at power-up, because this is normally the only time it is checked.