a716
This device has in the space under the battery a little switch that you can move to disable the Backup battery.
As to reach the switch you removed the main battery, this action performs an Hard Reset.
(this is another way along with the mutiple buttons to avoid accidental hard resets)
a730
You can use the second procedure mentioned above for the a620, I.E.
To press the power button and at the same time the soft reset button using the stylus.
a632/a636
To perform an Hard reset press and hold the power button while you press the tip of your stylus on the reset
switch at the bottom. This will cancell all data that unit is elaborating reinstating the device to the default setting
of the watch.
To perform a Clean Boot (that really coorrespond to a true Hard Reset), press the Speaker (-) button and at the
same time the button Change Modality and also the stylus on the reset button. This will reinstate the device to the
original default setting.
a626/a686/a696
To perform a clean reset, press the launch button simultaneously pressing the stylus on the reset button. Then
when a warning message appears follow the instructions and press to do clean reset, or press to leave the
operation screen. Performing a clean reset will delete all data.
Mars II/(O2 xda Zinc)
To perform a hard reset, use the stylus to reach the reset button found besides the device's camera button.
Keep the stylus on the reset button and press the Up Navigation button at the same time.
P535 - P735
To restore default settings tap Start > Settings > System tab > Default Settings.
Input ‘1234’ in password field and tap Ok confirm that you want to restore the default settings.
You can also perform the hard reset by pressing the UP button of the navigation key and the reset button at
the same time.
P550
To restore default settings tap Start > Settings > System tab > Default Settings.
Input 1234 in password field and tap Ok confirm that you want to restore the default settings.
You can also perform the hard reset by pressing the UP button of the navigation key and the power button at
the same time