I don't know if anything newer than that came out before this product was dumped in NZ. Given the recent comments though, I don't think your problems are firmware related, especially if they were working fine up until recently. The execption being if capacitors are starting to play up in these devices, but that hasn't been common, yet, and they don have a fan from memory so not likely.
Best bet is to hound freeview and JC Matthew. As I pointed out to freeview, this product has their logo all over it, so it's in their own best interest to make sure it works properly.