Default [Q] MIUI 2.1.20 bootloop after miui backup restore

Hello Community!

I updated from miui 2.1.6 to miui 2.1.20. Fresh install was working fine but when I used miui backup to restore my 2.1.6 settings, my device got into bootloop. Is this a common problem and is there a solution?

device details are:
u8800, kernel .35
cwm 5.5.0.4
miui 2.1.20 from ret4rt

Thank You