Security update+JB iphone

[i-sidd]

I have a JB iphone which I JB in december. Can I do a Security update 2009 -01. Its a 2.2 (5G77) version.

I just want to make sure that after updating the security it should not brick the iphone. Also, Since I don't know much about these stuff. Can I update the version from 2.2 to 3, or is it not recommended?

 

[jmann]

Don't worry 3.0 isn't released for the public now anyways. So you should download and use Pwnage Tool from here. And use that to make a custom 2.2.1 and then custom restore that IPSW in iTunes and you will be on a jailbroken 2.2.1.