RESET button
Press to reset and initialize the unit

Resetting the unit
If the unit stops responding while you are using it, you can reset the unit. Make
sure the unit is turned on, and then press the RESET button with the stylus.
Caution:
The reset function will not work if the unit is turned off when you press the RESET
button.

sharp_mobilion_hc4000_hard_reset

If the problem still persists after you have reset the unit, try the following (full reset)
remedy.
Caution:
The following procedure will cause all data on the unit to be lost and you must
restore data from your previous backup. However, any data added or modified
after your last backup will be lost permanently.
1. Turn off the unit
2. Remove the backup battery.
3. Remove the main batteries.
4. Wait for 30 seconds, then reinstall the main batteries and the backup battery.
5. Turn on and re-setup the unit using the H/PC Setup Wizard.
6. Restore your data from a backup.
Note:
If you forget your password, you must set up your unit again, using the above
steps.

Q: How do I backup my information?
A: It is important to always have a back-up of your electronic information.
Here are some suggestions:
· You can connect the unit to your desktop PC and backup your data to the PC using the Windows CE Services.
· You can copy your files to a PCMCIA SRAM Memory Card or a PCMCIA Flash Memory Card. Flash Memory Cards (space permitting) require no battery backup system.
Q: The unit does not seem to work. I changed the batteries but still nothing happens. What should I do?
A: Check that the battery replacement switch on the back of the unit is in the NORMAL OPERATION position, otherwise the unit will not turn on. Make sure the batteries are fresh (HC-4000/4100) or the installed battery pack is
fully charged (HC-4500).
Also, try to reset the unit by pressing the RESET button with the stylus. As a last resort, remove the backup battery and main batteries for 30 seconds.
Then put the main batteries and backup battery back in.
WARNING:
This procedure will cause the loss of all data in the unit! If the problem still persists, contact your local dealer for servicing.

General advice: Before you buy a new cell phone or new tablet, please try the following procedure to repair your device in a software way. First charge your battery, backup your important data if possible and in most cases take out SIM and SD card before doing factory reset. It is impossible to recover your data after doing a hard reset, so online backup is always important. For all of your data, a backup should be done on an external device, hard drive, raid system or media. With or without insurance, if your cell phone lost, damaged or stolen at least your invaluable data is backed up in a safe place. If you are about to sell your phone and you want to wipe your personal data, or if your phone affected with virus you have to do a hard reset. In some cases, you can delete the forgotten password or lock pattern from your device as well. All information is for devices with stock based ROMs. If you are using rooted device, always back up your EFS folder first, containing your IMEI info, etc.! Please also note, that a hard reset operation will not unlock your mobile phone's SIM lock or network lock, but it will remove the unlock pattern, remove the user password or PIN password (NOT the SIM card's 4 digit PIN code). Also note that the firmware version will not be affected in any way, it will not be downgraded, it will remain the same you are using and if you have rooted your device, root privileges remain also unaffected.