Unlocking IOS 5.0.1 on 3gs with new bootrom

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
Hi good day, i have a 3gs 8gb with serial 88103 on IOS 5.0.1. From the information i've gathered it was made in 2011 the third week. the baseband is 5.16.05 and i wanted to know if i could downgrade to IOS4.1 then flash with ipad baseband and unlock. this phone has the new bootrom.
Help plz. Thank you!
 
Last edited:

rjohnstone

macrumors 68040
Dec 28, 2007
3,486
3,401
PHX, AZ.
Nope. You can't downgrade the baseband.
Going back to 4.1 (not sure if they're even signing it anymore) will not help as the phone will still keep the 5.01 baseband.

Check the Dev-Team blogs, but I'm pretty sure you're SOL.
 
Last edited:

DerekRod

macrumors 6502a
Jan 18, 2012
820
0
NY
Its new Bootrom therefore even if you could downgrade it won't work.Unless you know exactly what you're doing I wouldn't try flashing the iPad baseband.Regardless if you try and do that you will fry the baseband and brick the phone
 

dhlizard

macrumors G4
Mar 16, 2009
10,213
118
The Jailbreak Community
Actually, you can use iPad baseband if that is your accurate serial # (and you should edit out everything but the 1st five digits on your post - for security reasons)
Go to iClarified.com for a tutorial that includes flashing the iPad baseband
Make sure you read all the warnings and consequences as you can never undo it.

One note, Ultrasn0w has not been updated to work with 5.1 yet, so stay on 5.0.1 for now
 

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
Actually, you can use iPad baseband if that is your accurate serial # (and you should edit out everything but the 1st five digits on your post - for security reasons)
Go to iClarified.com for a tutorial that includes flashing the iPad baseband
Make sure you read all the warnings and consequences as you can never undo it.

One note, Ultrasn0w has not been updated to work with 5.1 yet, so stay on 5.0.1 for now
ok thanks but its a friend's phone and if he just gets the phone to work, he'll be happy!...thats ok if the wifi and bluetooth doesnt work for him.

im running 5.1 on my 3gs 16gb with the old bootrom and its unlocked using ultrasnow fixer.
 

dhlizard

macrumors G4
Mar 16, 2009
10,213
118
The Jailbreak Community
ok thanks but its a friend's phone and if he just gets the phone to work, he'll be happy!...thats ok if the wifi and bluetooth doesnt work for him.

im running 5.1 on my 3gs 16gb with the old bootrom and its unlocked using ultrasnow fixer.
The Wifi and bluetooth should be unaffected by installing the iPad baseband. If they are not working, the phone has some other issue

With regards to warnings and consequences I posted, it will kill the GPS forever and cannot be removed.
 

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
The Wifi and bluetooth should be unaffected by installing the iPad baseband. If they are not working, the phone has some other issue

With regards to warnings and consequences I posted, it will kill the GPS forever and cannot be removed.
oh!thats ok about the gps...i read that if u install ipad baseband after the 28th week in 2011 it will brick your phone. I hope that doesnt happen even though this iphone was made the 3rd week
 

dhlizard

macrumors G4
Mar 16, 2009
10,213
118
The Jailbreak Community
oh!thats ok about the gps...i read that if u install ipad baseband after the 28th week in 2011 it will brick your phone. I hope that doesnt happen even though this iphone was made the 3rd week
You should be fine.
Many others whose phone was made in the early weeks of 2011 have done so without any issue.
 

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
thanks man...i appreciate the help!...i'll let u know what went on with the phone
 

bigjee

macrumors member
Jan 17, 2009
30
0
oh!thats ok about the gps...i read that if u install ipad baseband after the 28th week in 2011 it will brick your phone. I hope that doesnt happen even though this iphone was made the 3rd week
Yeah the 2nd and 3rd posters are incorrect as dhlizard pointed out. Anything after the 35 week of 2011 may or maynot have an old bootrom.

Since your phone is made in the 3rd week you have an OLD bootrom.

I have one that was on week 33 and it is unlocked on 4.1 after downgrading from 5.0.1 after installing the ipad baseband.
 

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
Yeah the 2nd and 3rd posters are incorrect as dhlizard pointed out. Anything after the 35 week of 2011 may or maynot have an old bootrom.

Since your phone is made in the 3rd week you have an OLD bootrom.

I have one that was on week 33 and it is unlocked on 4.1 after downgrading from 5.0.1 after installing the ipad baseband.
the 3gs i have has the NEW bootrom dude...does the one u have, has the old bootrom?
i think most of the 3gs 8gb has the new bootrom...is urs an 8gb also?
 

dhlizard

macrumors G4
Mar 16, 2009
10,213
118
The Jailbreak Community
i checked it using snowbreeze and it has the new bootrom...i dont think that will make the wifi stop working when i upgrade to ipad baseband.
Old or new bootrom is not the issue and has no bearing on this modification
The issue is Apple began using a new type baseband chip in 2011 and any attempt to change the baseband destroys the chip.
 

Applejuiced

macrumors Westmere
Apr 16, 2008
40,650
6,404
At the iPhone hacks section.
Old or new bootrom is not the issue and has no bearing on this modification
The issue is Apple began using a new type baseband chip in 2011 and any attempt to change the baseband destroys the chip.
Bam, and that is serious folks.
Dont ruin your phone by not checking the serial and installing the ipad bb on a newer baseband 3GS.
 

jadeinc

macrumors newbie
Original poster
Mar 14, 2012
12
0
Old or new bootrom is not the issue and has no bearing on this modification
The issue is Apple began using a new type baseband chip in 2011 and any attempt to change the baseband destroys the chip.
oh....is there anyway to check the baseband chip without opening the phone?
 

dhlizard

macrumors G4
Mar 16, 2009
10,213
118
The Jailbreak Community
oh....is there anyway to check the baseband chip without opening the phone?
None that I am aware.
From reading blogs, I know of a week 28 phone where the iPad baseband fried the BB chip. Hence, my recommendation is never flash any unit made after week 27.

Just to clarify a point about old/new bootrom on 3GS phones.
Apple changed from old bootrom to new bootrom about June 2009 (if I recall correctly)
So both old and new bootrom can accept the iPad baseband, just not the newer 3GS made after the 27th week of 2011.