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Had exact same problem after setting up some modem numbers as I was going out of town.
Anyway - after emailing Dell Tech and finally calling them, the only fix was to do a Hard Reset and all worked well.
However, I was able to do a back up via wireless card first, and then do a restore after it was fixed. If you do not have a wirelss card, back up data to either a SD card or to "built in memory".
Email me if more questions on how to.
Good Luck
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