Can not get to stock

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http://androidforums.com – I tried to flash another rom. When doing so somehow I unrooted myself.when trying to load up my saved backup it was also gone! So I loaded the original zip file back up. It said I was rooted again. ( dont know how) BUt mow my voice search will not work. I get the pulse, then three pulse vibrations to follow and it shuts. I went in to odin and Even tried flashable to get back to stock. It wont go. The files I tried using in Odin are: Home_i535VRALF_2 VRLAG1 Full tar md5 Both return with Tar is invalid. I have no problem with modems. I can odin or flah no problems. I do not know any other (General)