Roll back iOS without signature???

You need your shsh2 blobs saved from 9.3.3. If you don't have that no dice unfortunately (always make sure to save your shsh2 blobs for every version of ios if you can)

 

Blobs have been useless since the iPhone 4S and would not have helped you in this case.

There is no way to downgrade to an iOS version that is not signed on your phone.

 

It would be great if the iOS versions didnt need to be signed and verified by Apples servers

 

Actually, this isn't true. Blobs are back. Look it up on the Jailbreak Subreddit.

 

I wish blobs or shsh blob replay were fully back but they're not.
There is a few instances on older devices that you could downgrade on certain occasions with blobs saved but that process is not simple and kinda risky cause you could lose the phone functionality side of your device.

 

I didn't say it was easy or simple, but saying "blobs have been useless since the iPhone 4S..." is false.

 

True, under certain occasions are still useful.
I'd like to see them come out with something that bypasses them but not sure if that is feasible.
There was lots of talk before about shsh blobs and that they made lots of progress and everyone should start saving them again but nothing solid for newer generation devices has come out.