This is what i did .First i didnt any crash on 4.3.3 genuine OS install.
Second ,i update to 5.0 .
during the processus of this update the pre or post install crashing at this point no possibility to return to 4.3.3.
Four ,i did a restore from itune management software .It restores on a IOS 5.0 basic .Ive reinstalled all stuff after that.
N.B In this place everybody talks of DFU Mode ,I Know i know..
but when the time comes to me to did a restore ,the (DFU)mode was not in my head i tell you .
je fais la restoration instinctivement sans connaitre le dfu ni sans mettre le ipad 2 à off ou à on j'ai juste branche le ideviceand clic restore.
J'ai remarqué que IOS 5 semble comsommer plus de batterie rapidement
Happy XMAS ALL