I suggest one way: get rid of Symbian and embrace Android, track it closely making the phones upgradable to the latest possible release they can run (reducing platform fragmentation) and keep launching excellent hardware like Nokia always did. Everybody changes phones every couple years - as long as there are nicer, more capable ones.

Symbian is a dead-end. It runs on smaller, simpler and cheaper phones, but those are not the future.

Obviously nobody in a position to make such decision reads HN, so, this is a pointless exercise. But someone had to say it.