Learn how to unbrick/flash this device using sp flash tool from hereLearn how to flash this device using SP MultiPortDownloadTool from here Learn how to flash this device using WiseLinkTool 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 Y3S SPECS
Android 4.4.2 (KitKat)
115 x 62 x 11.7 mm
4-inch Touchscreen, 480 x 800 , IPS 233 ppi
1.0GHz dual-core Cortex A9 CPU
MT6572
512MB RAM
8GB Internal Memory
Supports up to 32GB microSD
9 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
1800mAh Battery
TECNO Y3S STOCK ROM
Y3S-G220-J1-KK-KE-SAFARICOM-20150310
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ADS HERE !!!