Motorola Defy Mini XT321 data:
GSM frequencies :850 900 1800 1900
Standard UMTS :900 2100
Type :Touch
Dimensions (W x H x D) :109,00 x 58,50 x 12,55 mm
Weight :107,00 g
Main display :Color / TFT
16M colors
320 x 480 px (3.20") 180 ppi
Talk time (max.) :2G: 600 min. (10,0 h)
Stand-by (max.) :2G: 504 h. (21,0 days)
Standard battery :Li-Ion 1650 mAh
RAM memory :512 MB
Memory cards :
microSD, microSDHC (up to 32 GB)
Operating system :Android 2.3.6 Gingerbread
Processor :Qualcomm MSM7225A
Processor clock :600 MHz
Touchscreen : yes
How to hard reset:
Warning! All data will be lost!
1.Power off your phone
2.Press together volume up + volume down + power button until recovery menu appears
3.Select "recovery" with volume buttons and press camera button to confirm
4.Press home button when Android logo appears
5.Select "wipe data" with volume buttons and press camera button to confirm
6.Select "yes" and press camera button to confirm
7.Wait until format ends
8.Select "reboot" and press camera button to confirm
9.Wait until phone restarts
That's it!
Here is video how to do: