iPhone 4s IOS 9.3.5/9.3.6 To IOS 6.1.3 Downgrade
Only works on iPhone 4s
3uTools 2.50 :
3uTools 2.38 : http://d.updater.3u.com/3utools/download/3uTools_v2.38_Setup.exe
iPhone IOS 6.1.3 ota ipsw : https://drive.google.com/file/d/11P120NGcQ0u4vzfXwk97jZTWLLRFwLeK/view .