Root problems with a Galaxy S2 can't return to sto

  mik61ish 20:40 28 Dec 2015

I have a Galaxy S2 I installed Cyangenmod 10 with their beta installer all went well was using it for some time, and I fancied installing lollipop and it all went wrong from there it wouldn't load so after a lot of trying different roms with no success and restoring back to stock 412 a few times I still can't do it the only way I could root again was with iroot. But it still won't let me use CWM or TWRP to flash again. Would like to update again to a more recent rom. Any help would be appreciated I have googled lots but just seem to be going in circles.

I have so called restored to stock but Samsung will not upgrade as the phone is not stock!

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