Ok finally updated using FAM otherwise nokia's own methods were useless. Lost teh multi boot feature of android / power kernal / normal but retained kernal settings and still having 1.1Ghz o/cd. Rest all apps still same no data loss of any kind. Now need to reformat the 8gb card as i dont need android anymore. I'm happy with iphone4 1000s of apps.

Performance at 1.1ghz seems better than before cept the standard apps manager is still taking ages to show updates.