Cannot restore Kies backup after firmware upgrade I backed up my Samsung Galaxy S2 on Kies before updating to Ice Cream Sandwich. After the upgrade I tried to restore, but the restore fails each time I try.
I had the same problem; this is what worked for me:


from the phone clear the app cache (I used app2sd)
restart phone
restart computer
start Kies
connect phone to computer
run restore again


Done.