Downgrade 1.1.3 to 1.1.1 or 1.1.2?

#1
I have two iPhones, one was using my GoPhones sim with no problems, till I updated to 1.1.3. Now the sim won't work in the iPhone at all. I have tried to downgrade to 1.1.1 and 1.1.2 but I just get errors before the downgrade even tries, something like there were errors that occurred (1). Anyone have any ideas how to downgrade this iPhone? It is a week 26 if that matters.
 

Hondamaker

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May 14, 2007
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#2
I have two iPhones, one was using my GoPhones sim with no problems, till I updated to 1.1.3. Now the sim won't work in the iPhone at all. I have tried to downgrade to 1.1.1 and 1.1.2 but I just get errors before the downgrade even tries, something like there were errors that occurred (1). Anyone have any ideas how to downgrade this iPhone? It is a week 26 if that matters.
You can downgrade to 1.0.2, but not to 1.1.2 yet. I got this info form www.modmyi.com
 

Hawk

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Aug 2, 2007
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#6
It's because the baseband has changed...yet again.
 

Lincoln

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Aug 11, 2007
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#7
Erica at TUAW has posted guide on downgrading. However as always, the baseband will not be downgraded and you will not be able to use the iPhone as a phone.

- John
 

Tinman

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Jul 16, 2007
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#8
It's because the baseband has changed...yet again.
Yes, but that has happened at least twice already (1.1.1 and 1.1.2) and have been reversible (downgrade the baseband). So you could have a 1.1.2 iPhone and as long as it was 1.1.1 OTB or earlier you could downgrade to 1.1.1, 1.0.2. all the way back to 1.0 and still have a working phone.

But as of right now once you go to 1.1.3 there is no going back.

Also, I have read a few erroneous reports that the "phone not working part" due to a mismatched baseband/firmware: some say it has always been like that. It hasn't. Shortly after 1.1.1 was released, but well before jailbreaking it was possible, it was discovered that if you updated to 1.1.1 you could successfuly restore to 1.0.2--even though you'd still have 1.1.1's baseband.


In any event it looks like the fight is on to get 1.1.3 jailbroken...


--
Mike
 

katra

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Jun 26, 2007
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#9
all iPhone restore files are zip files. if you change the "1.1.3.ipsw" to "1.1.3.zip" you can extract all its contents.

but, where is the baseband located within the zip ? if we can replace the baseband file with one from a previous restore file (1.0.2, 1.1.1 or 1.1.2) we can then recompile the zip and change it to "1.1.3.ipsw" and then restore with the newly created restore file making the iPhone think you are restoring your phone...:laugh2:


maybe this can work but i need to find out where the baseband file is....

if anyone knows...holla....:)
 

Tinman

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Jul 16, 2007
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#10
all iPhone restore files are zip files. if you change the "1.1.3.ipsw" to "1.1.3.zip" you can extract all its contents.

but, where is the baseband located within the zip ? if we can replace the baseband file with one from a previous restore file (1.0.2, 1.1.1 or 1.1.2) we can then recompile the zip and change it to "1.1.3.ipsw" and then restore with the newly created restore file making the iPhone think you are restoring your phone...:laugh2:


maybe this can work but i need to find out where the baseband file is....

if anyone knows...holla....:)
Suffice to say that doesn't have any chance of working.



--
Mike