[HarryT]

I didn't say "recent Kobo firmware is unstable"; I said "Kobo doesn't have a very good reputation when it comes to the stability of its firmware", and that's perfectly true. Kobo have a far, far worse track record for firmware bugs than any of the other major reader manufacturers. Hence my advice to actually ask Kobo owners before buying. Which is, I would add, sensible advice to follow when buying any device - owners are a much better source of accurate information about them than advertising.