TECNO B1 DA file needed.

Operation : Reset Settings/Format FS [ v2.06 ]

1. Make sure device is powered off. Power off, if need. Wait 20 seconds after
2. Insert USB cable in phone
Waiting for device connection ...

PTFN : MediaTek PreLoader USB VCOM (Android) (COM25)
MODE : PRELOADER PORT
PORT : 25
Waiting BOOT ack ...
PRELOADER : ACK confirmed!
BROM : Init BROM
BROM init passed!
CHIP : MT6580 , SBID : 0x8A00 , HWVR : 0xCA00 , SWVR : 0x0000
TYPE : LEGACY MTK
BROM : SecLevel : 0x00000005
BROM : SecMode : SBC+SDA
BROM : PRELOADER PORT
MODE : TECNO : BASE_SECURE | Manual : Disabled
AGENT : Look for suitable BootChain in DA ...
AGENT : MTK_AllInOne_DA.bin

AGENT : Selected AGENT doesn't have required configuration!
Check and select CORRECT SETTINGS for your device!

Reconnect Power/Cable!

from GSM-Forum http://bit.ly/2YsXNjr
via IFTTT