I got bad news
With an iphone 5 you cant really do much even if you had shsh blobs saved.
I'd try using ilex rat but I really doubt it will do anything and most likely it will get your iphone stuck in recovery mode. Since it wont fix/repair missing filesystem errors.
Once that type of damage is done only way to fix it is with a restore and you'd be stuck restoring to the latest 7.0.3
Cant you use TinyUmbrella to kick it off recovery mode? But i really dont care about the jailbreak, i just want it restored, or is it not possible either way.
No, tinyumbrella wont help.
If you want to just restore it you just gotta plug it to iTunes and hit restore.
It will then ask if you want to update and restore to the latest 7.0.3 just hit yes.
I thought you wanted to stay on JB 6.1.2
You can always restore your iphone to stock firmware with iTunes any time you want.
To this point it doesnt matter if i loose everything. And i know but the thing is that i dont want my iPhone to update to iOS 7, i want it to stay on 6.1.2