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Mend Samsung ER290 Restore Help Key

How can I restore factory settings on my samsung er290?, please help?

I have a samsung er290, I pressed a wrong programming key by mistake, and now it won't let me do anything, is it possible to totally reset the machine to factory settings so I can start again?
Please help, many thanks.

David
July 2009
SamsungSamsung ER290Office Appliances, Cash RegistersRestore Help Key

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Samsung ER290 Factory Reset - Help & Guide