"ChineseMiracle": how to repair "reboot with SIM card"

"ChineseMiracle": how to repair "reboot with SIM card"

1. make full flash backup for emergency case (use 921000 speed for fast operation)
2. select "safe format method"
3. make "format ffs"
4. remove/install battery
5. press and hold phone "Power" button during 30-40 sec to make phone powered-on
if phone Ok go to step-6
if phone not Ok, go to step 2 and select "complete format method"
6. restore original imei