User's Manual

PM451 Android 9.0 User Manual

System Maintenance

Factory Data Reset via Recovery mode

If you cannot turn on the device, try the following steps to do factory data reset using Android

recovery mode.

1. Press and hold

SOFT_RIGHT

and

in the sequence of keys when PM451 turned off.

2. After short vibration, release the keys.

3. Using the keys below, select

Wipe data/factory reset



Move down

– any keys except Enter key and Power button



Select the menu

– Enter key or Power button

4. After wiping the data, select

Reboot system now

Figure 56 Recovery mode key combination

Figure 57 Factory reset via recovery mode