My AK2 broke. My R4 still works. Unlikely I can ship it back for a refund due to stupid local posting costs. So what do I do? I had an R4 and wanted an AK2 for the sake of SDHC support. Now I have a SDHC cart that is broken and a working cart with no SDHC support. See where this is going? It's quite an eccentric idea, but if technical details would be known, would it be possible to fit the one chip on the AK2 that has, among other things, SDHC support in place of the R4's chip? I'm not that worried about the firmware part cause there's lots of hybrid firmware out there. Anyone here knows a bit of technical detail about the R4 and/or AK2 to tell me if it'd be possible?