Hello Everyone, 

Sometimes, although rarely, a mobile phone will completely freeze during normal operation or it may not correctly start or boot because of some incompatibility with a recently installed application.  This restart failure may persist even after removing and reinserting the battery. 

Many Smart Phones have a manual or hard reset procedure for completely resetting the phone back to its original factory settings.  A hard reset is performed, generally, by pressing a combination or series of keys on the phone, itself, and, therefore, does not require the operating system in order to be successfully completed.

I strongly suggest that you locate the hard reset procedure for your mobile device, write it down, and keep it handy in case of extreme emergencies.

Note 1:
It is best to reset your mobile device via the operating system.  A hard reset is only to be used when all other attempts at rebooting the device have failed. 

Note 2:
If your device fails to reboot because of a recently installed application, while the phone is powered on, albeit in a useless state, attempt to connect the device to your PC via USB in order to access the phones’ memory.  If the phone will connect, from the PC, uninstall the recently installed program and attempt to reboot the device. 

Note 3:
The following procedure is for either the original Samsung Blackjack or the Samsung Blackjack II. Smart Phone, only.

Note 4:
Upon successful completion of a hard reset, all user data will be erased including any third-party applications such as Mobile Speak for Smart Phones.

1.
Remove the micro SD card, if one is inserted.

2.
Remove the battery.

3.
Wait at least twenty seconds and then reinsert the battery.

4.
Replace the battery cover on the back of the phone.

5.
Press both the [POWER] and the phone’s [UP ARROW] button, simultaneously.

6.
Follow the onscreen confirmation prompts. 

That is all there is to it.

Good Luck,

Mark