Two Methods | Fix Jailbreak Failed With 3Utools iPhone/iPad iOS 9.3.5 - 9.3.6 - ICTfix
Download iOS 9.3.5 for iPhone, iPad and iPod touch
Bypassed iPhone 4s iOS 9.3.6 with working Appstore. No Data sync (photos, notes, ect) FindMy, jailbreak (unable to install 3rd party apps from JB websites bc no activation), ect. Done using cheap
How to Downgrade iPhone 4s From iOS 9.3.5 to iOS 8.4.1 / iOS 6.1.3 (Without SHSH Blobs) – iPodHacks142
iOS 9.3.5 Security Update Released for iPhone, iPad [IPSW Downloads] | OSXDaily