droidxpert Hello, bootloping problem on old device like s820, mostly cause by internal storage problem.
Please do "Storage Test" in UFI Android toolbox right after you make Identify Devices.
This will test random read and verify in random sector in internal storage. If device failed to read back, then internal storage is damage.
droidxpert Is it the RPMB problem?if so what to do!!!
No, I don't think so. RPMB is protected block for manufacture security purpose.
The size of boot and rpmb for MT658x is must not exeed to 6MiB, but this is for eMCP replacement.
droidxpert Does any MTK device withou NVRAM or corrupted NVRAM also boot loops?
AFAIK, damage nv will only cause invalid imei and baseband unknown. And will not cause bootloop problem.
