Help to restore, jailbreak, and unlock iphone 4, iOS4.2.1

[bubuham]

Hello all,
This is my first time try to do jailbreak and unlock myself. Please slow down and guide me step-by step .
I have an iphone 4, iOS4.2.1, modem firmware is 01.59.00, unlock with Tmobile now. I need to resetore this iphone with the same iOS4.2.1 , jailbreal and unlock again due to some corruption in the iOS installing in the phone now it won't let me install anything else from Cydia at all. It can d/l data from Cydia but when doing installation, where the errors occured in RED color then nothing get installed.
I did download the ipsw of 4.2.1, pwnage tool ( for Mac), then run the tool to create the ipsw custome already. up to the step to restore, I am afraid to do it if something not correct then I will lose the unlock capability.
I just want to learn how to do it so I dont have to spend $30 for some1 to do jailbreak

please help me.

[j3st3r]

since you have a mac the easiest thing would be to follow this guide iClarified - iPhone - How to Jailbreak Your iPhone 4 Using PwnageTool (Mac) [4.2.1]

[Simon]

First thing to find out is what SHSH you have with tiny umbrella: The Firmware Umbrella - TinyUmbrella

[bubuham]

Ok, I download tinyumbrella program, ver. 4.32.01. I ran the program then click on "SAVE SHSH" then look like it ran the save but i dont know where it save the "shsh" to ? and what is the " Start TSS server" for ?

[Simon]

Just click on your device and it should list what SHSH you have under general.

[bubuham]

here what it showed on the general box :


what do I have to do next ?

[Simon]

Looks like you have 4.2.1 SHSH. So you can follow the guide j3st3r gave you. You can even make a custom 4,3,2 if you want with pwnage tool. your choice.

[bubuham]

looking at the guide j3st3r gave, there is a step that using itunes to restore. Question is if the itune will upgrade my firmware when selecting the custome ipsw that was created by pwnage tool.
Do I need to run TSS server when doing restore custom from itunes?

[Simon]

If you choose to restore to a custom 4.2.1 then yes you need to run the TSS server. If you choose to make a custom 4.3.2 then no, you dont need to run TSS server.

[bubuham]

should I stay with 4.2.1 or upgrade to 4.3.2 ? if I upgrade to 4.3.2, can the phone still unlockable? and all the functions such *** mms, GPS, sms etc ... will work properly? cuz the big issue I have now on the phone is the GPS not turn-on at all when I using maps app, or magellan map. Even though, the location service was on the "ON" position.

[Simon]

As long as you only restore to custom firmware you will still be able to unlock.

[bubuham]

I just try to restore via itunes with my custom 4.2.1, and turn on tinyumbrella with "TSS server " running. It restored about 1 minute then pop up error 14 and 21? Now the iphone under the itumes + usb logo. what should I do next ?

[K-Mann3]

Ok I got a itouch an I dnt know how to jailbreak it... People telling me so many diff ways an I'm bout to kill myself.... And how do I find out an save that SHSH watever?

[Simon]

I just try to restore via itunes with my custom 4.2.1, and turn on tinyumbrella with "TSS server " running. It restored about 1 minute then pop up error 14 and 21? Now the iphone under the itumes + usb logo. what should I do next ?

That means you didnt enter pwned DFU. Make sure to use pwnage tool to enter pwned DFU first.

[bubuham]

I got it !, after reboot Mac, then change usb port, then follow pwnage DFU mode , I had successfully restore the phone and unlocked it. The Maps gps works, the Cellular data network option show up so I can enter in the tmobile T-zone info. Anyway it works now thanks so much buddy

[Simon]

No prob

[alejoarango10]

How do I jailbreak and unlock my iPhone 4 running on 4.2.1? I'm a Windows user...
Tks for the help

[iYeow]

if your bb is 03.10.xx , you can only jailbreak but not unlock at 4.2.1

Run redsnow to get tethered jailbreak N Greenpoison RC5 again to get untethered jailbreak

[alejoarango10]

Ok
Tks
Any chance of getting step-by-step instructions on how to do it?
Previously I had a 3Gs and I jailbroke via jailbreakme.com, is this greenpoison similar? Will I get the same results?
Tks again

[iYeow]

Do you want to go for the latest 4.3.2 and still preserve your current baseband ?