Wifi not working/Unroot

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http://forum.xda-developers.com – Ok so today i noticed my wifi doesnt work anymore, it wont turn on... so i was wondering if there was anyway to go back to full stock so that the clerk at Telus wont notice it was rooted and stuff? i still have my 30 days with them i believe so, i dont think he looks at the system for root and flash anyway, can someone let me know? thanks! (HowTos)