If you have sure that this problem arrives after upgrade then you need to follow the below process to solve this problem.
- First download your SHSH blobs from Saurik’s server to laptop and connect iPhone to it. Then select Device/Version ->Advanced Options and choose firmware version for downgrade process. Then grab your SHSH files.
- Download firmware that you wish for to downgrade to from your iPhone model using iPhone Download option.
- Then activate DFU and recovery Mode on iPhone.
- Run TinyUmbrella and click the “Display SHSHs” button. Finally hit “Start TSS Server”.
Your iPhone will be downgraded/restored to the iOS version. This process has to be effective for solving complicated type of problem.
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