I would suggest doing a "Reset". You will loose all your data, but at least you will be able to use it. You do a Reset by removing the bottom case, turning on the BOSS, them pressing the Reset button located inside.
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ALL I NEEDED WAS THE OWNERS MANUAL FOR THE CASIO BOSS SF8000. ANOTHER E;MAIL STATED I PURCHASED 1 MANUAL KIND OF CONFUSED AS I WAS NEVER ASKED FOR A DELIVERY ADDRESS. CAN YOU KINDLY LET ME KNOW WHATS HAPPENING?
THANK YOU GARY KRUPSKY, 3631-7771352.....FAX 3631-7771353
On the back battery cover there is a reset button,just push it w/a toothpick or pencil point. It will reset you B.O.S.S. so you can re-enter info. I've had mine since '00 e-me @ email@example.com if I can help or confuse you more. Good luck! P.S. I'm not assotiated with casio.
Once the DATA ERROR DISPLAY appears,You will not be able to INPUT or EDIT DATA, though you will be able to recall Data after pressing CLEAR to clear the error message.**YOU WILL
WANT TO SAVE ALL YOUR DATA OR WRITE EVERYTHING DOWN AT THIS POINT, BECAUSE THE ONLY WAY TO GET
THIS DEVICE BACK TO NORMAL OPERATION IS TO PRES RESET IN THE BACK -IF YOU PRESS RESET YOU WILL LOSE ALL INFORMATION PERMANENTLY.
In order to return the memory to normal (allowing further input and editing of data), you must perform the RESET OPERATION to clear the memory of all data-Make sure you have backed up or taken a hardcopy of this information before Resetting or it will be gone and there is nothing you can do to get it back.Once you have RESET you can re-input the data you have written down.
WHAT CAUSES THE ERROR MESSAGE?Interruption of battery power.Severe electrostatic charge,impact,change in temperature
or humidity.Hardware Problem.
Recommendations:Replace batteries every 2 years, regardless of use.Use only CR2032 Lithium batteries.Replace all batteries-Never mix old ones with new ones!
Caution: All data stored is lost if you remove more than 1 battery at a time. The following Info is per the instruction manual-WHICH ALSO SAYS :Be sure you keep a separate copy of all important data that you store in the SF-5100/SF-5300.Hope this helps.