Thanks to Alasdair Dunlap-Smith for writing this FAQ entry.
Many people (myself included) have reported problems installing packages on the Datarover 840F. It seems lately many people have gotten Datarover 840F’s cheap and brand-new on eBay – problem is, they all seem to have pre-release ROMs, which are incompatible with connectivity software such as WinPCLink and Josh Carter’s package mailer. As Josh has said, the only hardware different between the Datarover 840 and 840F is the 840F’s use of flash ROMs, which can be upgraded. The solution to this would be to try and re-flash the Datarover’s ROM with a newer release version. The problem is “How?” Well, that’s what I’m going to try to lay out in detail.