easiest is to FACTORY RESET... BUT you loose your data...
if u want to keep your DATA... I have not researched on Honeycomb yet, but should be the same as Gingerbread... can try running this ADB script from my previous device forum...
Download the UNROOT.zip from there and run it...
Make sure you have installed Samsung KIES and your device already recognized by your PC and set to DEBUG MODE...
If you dont understand the above, I cant help you any further...
Samsung Galaxy S4 i9500 (MIUI)
Sony Xperia S [MIUI] (Wife)
MY FORMER SMARTPHONES
Sony Xperia SL (SOLD)
Samsung Galaxy Nexus GSM i9250 (SOLD)
Samsung Galaxy Tab Plus P6200 (SOLD)
HTC Mozart 7 (SOLD)
HTC EVO 3D (SOLD)
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HTC Touch Pro (Dead)
HTC Diamond (Dead)
Palm Treo 750V (Dead)
HTC Universal (Dead)
Palm Treo 650 (Dead)