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O2 Stealth Hard Reset not working

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Oct 25, 2007
I've got an O2 Stealth that I'm trying to clear the contacts and calender memory. I did a Google and it said to do a Hard Reset. So I followed the instructions, hold the Windows and OK key and hit the reset with the stylus. It seemed to work, but after about 2 blue bars into the reset (it says Format Dsk2 on the screen, black background) it says "Fail -Reboot", the phone automatically restarts and then hangs on the Welcom O2 screen (I waited 5 hours the first time).
I pulled out the battery, put back in and then the phone turns on and works like normal - but no data has been cleared.
Any ideas?