Unjailbreaking iPhone 3GS custom ipsw?

Recently I decided I didn't to be jailbroken so I went to do the process on iTunes on my PC where I clicked restore and a message would appear about backing up my contents. I did and as the time passed a message came up saying my iphone couldn't be restored. I'm still jailbroken and have all my stuff but I want to unjailbreak. Note again I have an iPhone 3GS on ios 6.1.3 and I used a custom ipsw when I jailbroke.

Okay I've done this many many times, firstly back up your phone, make sure it is backed up.

then put your phone in 'recovery mode' you can google how to do that, its a special combination of holding the off and home button.

then iTunes says you have to restore your phone to the latest software.

remember, back up then recovery mode.

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