I'm Having Nokia 5800 XpressMusic with RM-427... Not 428.... The one released only in CHina & lacking WIFI....

1st tell me which Software is best, easy & Advanced regarding Flashing or updating
Nemesis or Pheonix or JAF

2nd Can i flash or upgrade my phone with the Product key of RM-356
I guess its not suggestable... but did anybody try this....