Barclays Bank App not working even after unrooting custom rom

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http://forum.xda-developers.com – Hello guys, I unlocked my BL and flashed a rom last night as stock 4.2 was so laggy for me. I need to be able to use the barclays bank app. so far i tried the methods on this post: http://forum.xda-developers.com/show....php?t=1823649 with no joy so i removed root via SuperSU app. I checked xbin and bin and SU file was gone. I still get the RP029 error. Also have the 99999 error. If all fails is there a pure stock rom that i can flash without wipe? im on a 4.2.1 rom thanks (HowTos)