Ios 9 update error

You can't update your phone to iOS 5.0 Not even if you have your SHSH saved. So nothing you do will allow you to install 5.0 right now. At least for the time being. Your only option is 5.01. The problem is that apple is no longer signing 5.0 and no shsh blobs will help you neither because a new security measure implemented on all 5.X

So if you need an unlock in order to use your phone I would highly recommend not updating to 5.01 because UltraSnow is currently not working on 5.01 despite of what baseband you have. No even with 1.59 baseband (but this is just until ultrasnow is updated to work on 5.01) If you don't need an unlock then you can safely update to 5.01 and do a tethered jailbreak using the latest redsn0w and pointing the ispw to 5.0

And before doing anything please update to the latest iTunes.

I hope this helps.

I'm able to restore iOS 5.1.1 on my phone using sn0wbreeze. I'm posting the details here in case someone else encounters the same problem.

Initially I used redsn0w to create a custom firmware file but it failed to restore (with errors mentioned in the question and others like error 14, etc.).

Then I used sn0wbreeze to create a custom firmware stitched with my shsh blobs and iTunes restored it without errors.

Here are the steps I followed:

• Downloaded a firmware that i wanted to restore (5.1.1 in my case).
• Added my shsh blobs for that firmware using iFaith mode in sn0wbreeze.
• Created the custom IPSW in sn0wbreeze and stored it on my desktop.
• Put the iPhone in pwned DFU mode. Use iREB or redsn0w to get into the pwned DFU mode.
• Used the custom ipsw file to restore in iTunes.

I don't know if these things count, but during the process my antivirus was disabled and I had commented out any gs.apple.com lines in my hosts file.