SAVE SHSH 5.1 with TINY UMBRELLA 
Before you ask; Yes a solution for the 5.x firmware nonce is being investigated… None of us have a working solution yet though. Hang tight.
I have a couple trails and ideas I am trying out for 4.x baseband based restores to avoid 10xx errors. Until then save your signatures as you will never know when they may come in handy…
TinyPwn update: I’ve not had much time in the past month to work on this. Real life drama, work, etc have taken much of my time. I still intend on a release… eventually…

Effectively it’ll just have to be done when it’s done…
TinyUmbrella [OSX]
http://cache.firmwareumbrella.com/downloads/TinyUmbrella-5.10.00.pkgTinyUmbrella [WIN]
http://cache.firmwareumbrella.com/downloads/tinyumbrella-5.10.00.exes2