Learn how to unbrick/flash this device using SP Flash Tool from here Learn how to unbrick/flash this device using WiseLink Tool from here Learn how to flash this device using SP MultiPortDownloadTool 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 C9 QUICK SPECS
Android 6.0 HiOS (Marshmallow)
5.5-inch Touchscreen, 1920 x 1080 , IPS 400 ppi
153 x 76.4 x 10.4 mm
1.3GHz quad-core Processor
MT6753
Mali T720 GPU
2GB RAM
16GB Internal Memory
Supports up to 32GB microSD
13MP Rear Camera, LED Flash, Auto Focus
13MP Front Camera
Dual SIM
EDGE / GPRS
WCDMA
4G
WIFI 802.11 b/g/n
bluetooth 4.0
3000mAh Battery
TECNO C9 STOCK ROM
C9-H535-B1-M-HiOS-20160601
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ADS HERE !!!