DESCRIPTION

Mediatek MT6739 
H312I16A.YBT.S611B8.YEZZ.ART1.US.3+32.10.0.V04.20210630
MDDB_InfoCustomAppSrcP_MT6739_S00_MOLY_LR12A_R3_MP_V86_1_ulwctg_n.EDB
Install ROM :

- Unpack FlashTools, and Click on Flash_tool.exe
- Select "scatter-Loading" and search MT6580_Android_scatter.txt in ROM
- Wait file to be added into Flash Tool
- Select "Download Only" or if upgrade "Firmware upgrade"
- Turn off your phone, remove the battery (if the battery is removable) and replace it after some seconds (and don't turn on the phone).

- Press “Download” button to start
- and connect your phone into the computer via USB data cable.
- The process will start and a red progress bar will appear after color purple, yellow.
- And green circles display
- Finish !ipset

Official Firmware from YEZZ Support

※Please make a backup of your device before installing or updating ROM