Why we can't rollback a firmware

I have posted this question about why I have lost my player track on my HTC ONE X but is still not answered.
now my follow up question is why we can't rollback a firmware because you ( Sony ) thinks you have solved a problem for a galaxy note or xperia you may brake on a other device like mine HTC ONE X so now I am stuck whit a firmware that is totally unacceptable and when you ask a question about it you get totally ignored.
So please give us a opertunity to rollback a firmware so we at least have something instead of nothing at all.

Unfortunately it's not possible to downgrade this device at the moment. I have sent your feedback about this further on along with the problems you have reported to have this looked at.
- Community Manager Sony Xperia Support Forum
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