Zte Kis pro data:


GSM frequencies :850 900 1800 1900
Standard UMTS :900 2100
Type :Touch
Dimensions (W x H x D) :116,00 x 61,70 x 12,60 mm
Weight :120,00 g
Main display :Color / TFT
256k colors
320 x 480 px (3.50") 165 ppi
Talk time (max.) :2G: 240 min. (4,0 h)
Stand-by (max.) :2G: 240 h. (10,0 days)
Standard battery :Li-Ion 1200 mAh
Internal memory :4 GB
RAM memory :512 MB
Memory cards : microSD, microSDHC (up to 32 GB)
Operating system :Android 4.1 Jelly Bean
Processor :Qualcomm MSM7225A
Processor clock :1,00 GHz
Touchscreen : yes

SAR (10g) :0,439 W/kg


How to hard reset:


Warning! All data will be lost!
1.Power off the phone
2.Push together volume up + power key until Orange logo appears on screen
3.Select with volume keys "wipe data" and push power to confirm
4.Select "yes" and push power to confirm
5.Wait until format ends
6.Push power to confirm "reboot"
7.Wait until the phone restarts

That's it!

Here is video how to do: