Can it be Jailbroken

[JN46R4]

Ok so my Cydia is messed up right now and so I'm planning to get my iPhone Jailbroken to 4.0.

Can I Jailbreak mine....here are my Specs

iPhone 3GS 16G
Firmware 3.1.2 Jailbroken (Did it with BlackRain long ago)
Model: MC148C
Modem Firmware: 05.11.07

Can it be Jailbroken and if yes, how (Currently own a Macbook)

 

[Applejuiced]

You currently have a tethered or untethered JB?
Can you restart the phone without running blackrain in order to boot up again?

 

[JN46R4]

You currently have a tethered or untethered JB?
Can you restart the phone without running blackrain in order to boot up again?

Um I used the first blackrain for 3.1.2 so when my iphone shuts off the Jailbreak is always there....ONLY jailbreaked it once and never needed to do it again

 

[Applejuiced]

Ok sounds like you have the old bootrom without a tethered JB.
Just follow this:http://www.iclarified.com/entry/index.php?enid=10217
You will be able to update your phone to custom 4.0 ipsw created with pwnage.

 

[JN46R4]

Ok sounds like you have the old bootrom without a tethered JB.
Just follow this:http://www.iclarified.com/entry/index.php?enid=10217
You will be able to update your phone to custom 4.0 ipsw created with pwnage.

So it doesnt matter if my Model is MC148C?

 

[Applejuiced]

Model number means nothing.
Bootloader does.

 

[JN46R4]

Model number means nothing.
Bootloader does.

Sorry I got one more question Iclarified says Pwnage 4.0 I think and I heard that 4.01 is out....Would it be best to use 4.01

 

[Applejuiced]

Sorry I got one more question Iclarified says Pwnage 4.0 I think and I heard that 4.01 is out....Would it be best to use 4.01

Yes, 4.01
They display 4.0 but when you click on those links to download pwnage the 4.01 version downloads anyway.
http://www.blogiphone.fr/PwnageTool_4.01.dmg