iPhone iPhone 4 iOS 7, have SHSH blobs and wanna downgrade ?

[emkfr]

Hello,
By advance, sorry for my poor English level, It's not my native language.

So here is the deal :
I have an iPhone 4, and I recently upgrade to iOS 7 but I don't like it because Its not running smoothly ...

I have jailbroken it in the past but not when I was on iOS 6 (I install iOS 6 "officialy");
It was way before that so actually I just have the SHSH blob for older versions of iOS (4.1 to 5.0.1 ...)

Several questions :

Can I downgrade it to 5.0.1 ? If yes, how I do that ?
Will I be able to then upgrade to iOS 6 version [the latest one] even if I do not have blobs for it ?

Regards.

 

[dhlizard]

If you have older version of iTunes, you may be able to restore to 5.0.1 if you have saved a complete 5.0.1 SHSH, but you cannot move to any iOS6 version without saved SHSH.

 

[emkfr]

Ok thanks

 

[emkfr]

I used redsn0w 0.9.15.b3 to restore to 5.0.1 with my SHSH blobs. I found instructions here http://www.jailbreakqa.com/faq#94647
"Instructions for iPhone 4 and 3GS, iPad 1, and iPod touch 3rd and 4th generation restoring to iOS 5.x"

But after that my iphone is stuck on infinite reboot loop :
Logo Apple -> Spinning wheel -> Reboot -> Repeat

After the restore via redsn0w I had a warning message "Couldn't obtain fresh baseband blobs. Its probably no longer being signed" ...

What should I do ?
Does someone have a better tutorial to read ?

EDIT : Sorry I finally managed to find a solution --> IPSW Signed build with iFaith + iReb to avoid error on the old itunes version. My iPhone is finally smoothlyas hell ^^ (but ok, im running the 5.0.1 iOS ...)