hi here is a custom 4.3.3fw + ireb for iphone 3gs to upgrade and preserve baseband you have for unlock.. 
MEGAUPLOAD - The leading online storage and file delivery service
This custom iphone 3gs 4.3.3 iOs firmware doesnt update your baseband so you keep your unlock and jailbreak,
at the same time by simply restoring to the firmware specific to your device.
Important: You have to first use iReb to put your device into pwned DFU mode.
If you don't use iReb to put the phone into pwned DFU mode first, the restore will fail in iTunes.
back up your iphone first then you can re-sync back your legitimate files etc. WHEN DONE..you will lose any jailbroken apps.
1: download files remember iphone 3gs 4.3.3 this is.
iphone 4 download coming later(NOT VERIZON)
2
pen ireb choose your device = iphone 3gs and let it put your phone into pwned dfu state
3
pen itunes,it will tell you ,you have iphone in recovery mode
and need to update/restore....
DO NOT SIMPLY CLICK RESTORE!!! see below!!!!
4:YOU HAVE TO HOLD SHIFT WHILE CLICKING RESTORE THIS WILL OPEN UP BOX AND YOU POINT TO THE CUSTOM 4.3.3 YOU JUST DOWNLOADED and let it restore
once finished ,IT WILL DISPLAY NEW IPHONE OR RESTORE FROM BACKUP,IF YOU BACKED UP YOUR DEVICE YOU CAN RESTORE FROM THAT BACKUP
you will be on the same baseband AS BEFORE and can use ULTRASN0W TO UNLOCK THROUGH CYDIA ETC...ETC...
I AM NOT RESPONSIBLE FOR ANY DAMAGE OF YOUR DEVICE,I HAVE JUST USED THIS ON MY 3GS FW 3.1.3 AND ALL WENT FINE...THANX MICKY
iphone 4 : http://www.megaupload.com/?d=3A660HK4
same as above but for iphone 4 enjoy,however this as not been tested by me as i have no posh iphone 4
.but cant see any problems- let me know?? instructions same as 3gs just obviously different ipsw custom for IPHONE 4 .
once again these custom firmwares are for people allready unlocke and want to update to newest firmware and preserve baseband for your unlock thnx micky
MEGAUPLOAD - The leading online storage and file delivery service
This custom iphone 3gs 4.3.3 iOs firmware doesnt update your baseband so you keep your unlock and jailbreak,
at the same time by simply restoring to the firmware specific to your device.
Important: You have to first use iReb to put your device into pwned DFU mode.
If you don't use iReb to put the phone into pwned DFU mode first, the restore will fail in iTunes.
back up your iphone first then you can re-sync back your legitimate files etc. WHEN DONE..you will lose any jailbroken apps.
1: download files remember iphone 3gs 4.3.3 this is.
iphone 4 download coming later(NOT VERIZON)
2
pen ireb choose your device = iphone 3gs and let it put your phone into pwned dfu state3
pen itunes,it will tell you ,you have iphone in recovery mode and need to update/restore....
DO NOT SIMPLY CLICK RESTORE!!! see below!!!!
4:YOU HAVE TO HOLD SHIFT WHILE CLICKING RESTORE THIS WILL OPEN UP BOX AND YOU POINT TO THE CUSTOM 4.3.3 YOU JUST DOWNLOADED and let it restore
once finished ,IT WILL DISPLAY NEW IPHONE OR RESTORE FROM BACKUP,IF YOU BACKED UP YOUR DEVICE YOU CAN RESTORE FROM THAT BACKUP
you will be on the same baseband AS BEFORE and can use ULTRASN0W TO UNLOCK THROUGH CYDIA ETC...ETC...
I AM NOT RESPONSIBLE FOR ANY DAMAGE OF YOUR DEVICE,I HAVE JUST USED THIS ON MY 3GS FW 3.1.3 AND ALL WENT FINE...THANX MICKY
iphone 4 : http://www.megaupload.com/?d=3A660HK4
same as above but for iphone 4 enjoy,however this as not been tested by me as i have no posh iphone 4
.but cant see any problems- let me know?? instructions same as 3gs just obviously different ipsw custom for IPHONE 4 .once again these custom firmwares are for people allready unlocke and want to update to newest firmware and preserve baseband for your unlock thnx micky
if not press the green tab to tell me to f**Koff 

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