SP9850KA__HENGDA__1821__8.1.0__Coolpad_1821_Vietnam_V1.00__OPM2.171019.012__sp9850ka_1h10.7z
Backup InfinityBox CM2MT2 firmware, please use CM2MT2 to write
Model: Coolpad 1821
Version Firmware: 1821_Vietnam_V1.00
Android version: 8.1.0
Updated: 19.12.2018
Board Platform: sp9850ka