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Resetting Your Hewlett-Packard 100LX Palmtop 

If your palmtop fails to respond to keystrokes or otherwise behaves unusually, you should do a system reset (also called rebooting the computer). Do not remove the batteries.

Caution A system reset erases the contents of system RAM (but not the RAM disk). Therefore, any data not already saved will be lost.
You perform a system reset by pressing CTRL+ALT+DEL (that is holding down CTRL and ALT and then pressing DEL).

If a system reset doesn't work, as a last resort you can attempt a hard reset by simultaneously pressing CTRL + ON + UP arrow (the gold arrow).

You will be asked whether or not you want to initialize the RAM disk, which erases its contents. If you type y (for yes) and press ( ENTER ), a hard reset will occur and all data is lost; If you type n (for no) and press (ENTER), a system reset is attempted.

CAUTION A hard reset erases the contents of system RAM and the RAM disk. All data on drive C (the RAM disk) will be lost. Also, settings changed via the Setup Utility (for example, battery charging) will revert to their default states.
HP 200LX hard reset

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.