Support S2: reinstall Icecream sandwich after Jellybean?

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http://androidforums.com – Hi Everyone, I upgraded to Jellybean a few weeks ago and have been experiencing a range of problems as some may have see on this forum (in-call volume too loud, self discharge in flight mode over night). I realise the change was a big mistake and I would like to know if I have any chance to revert to an earlier version. I only bought my S2 1 year ago, and it has been well treated, with very few applications installed. Please can anyone offer some advice on downgrade options? Many thanks! (General)