hello
only you can upgrade to earlier versions of firmware if you have the SHSH blobs corresponding to that version , but we split , look to see all the SHSH blobs that shows cydia to do this, go to cydia and go to " TSS center " above with green letters you should see the SHSH you have, if you listed some, you can go back to that version perfectly, but in case you do not have one , I advise you to look for if something had been overlooked , only you can restore the same version ( ie 5.1.1 ) with iFaith and upgrade to the latest version , but the trouble is what the jailbreak, the jailbreak this iOS is not permanent and therefore , turning the device , you will need to return it oN using this program , so think about it before you act , anyway , if you want more semi- tethered jailbreak , I advise making an artificial SHSH of iOS 5.1.1 for the not so if you Apanás well with the jailbreak, you can restore to the same version , but before that , look to see if you have any SHSH that you have gone through the cydia and let us see what SHSH you , here I pass the link to the jailbreak of iOS 7.1 semi - tethered for iphone 4: