Learn how to unbrick/flash this device using sp flash tool from here
Note
Follow the instructions on how to flash the device carefully from the link above
I will not take responsibility on whatever may happen to your device.
Make sure you are downloading the exact ROM of the device you want to flash because
flashing a wrong preloder, will make the device completely dead
(can't power on, can't charge and will not be detected by a computer)
TECNO Y2 SPECS
Android 4.4.2 (KitKat)
4-inch Touchscreen, 480 x 800 , IPS 233 ppi
1.3 GHz dual-core
MT6572
MT6572
512MB RAM
8GB Internal Memory
Supports up to 32GB microSD
2 MP Rear Camera, LED Flash, Auto Focus
0.3 MP Front Camera
Dual SIM
EDGE / GPRS
WCDMA
WIFI 802.11 b/g/n
bluetooth 4.0
2800mAh Battery
TECNO Y2 STOCK ROM
Y2-H721-A2-KK-20151202
Y2-H721-A2-KK-20151202