[BL3.9/BL4.6] Downgrade to 3.9 now, and software upgrade later !

**ivanlinares** · 03-04-2008 07:05 AM

Originally Posted by Number_41

Why is acujo's tutorial set as feb 12th?

N41

same question here... how to know the 3.9 BL has the blank stuff needed to upgrade.

**donky** · 03-04-2008 07:15 AM

so now can i update my 3.9 to 4.6 via softtware?

**drg** · 03-04-2008 07:24 AM

Originally Posted by Number_41

Why is acujo's tutorial set as feb 12th?

The method to downgrade to BL3.9 is not new. gbootloader has been out for a while and this method has not changed. This is why the date is Feb 12th.

What has changed is the BL3.9 NOR. This new NOR which is included in the updated package on aCujo's site has the bootrom locations blank, which allows future software-only re-writing of the bootloader at will. The new NOR was created by MuscleNerd very recently, but the steps are the same with this new NOR.

**drg** · 03-04-2008 07:25 AM

Originally Posted by donky

so now can i update my 3.9 to 4.6 via softtware?

Yes, but only if it is a BL3.9FakeBlank... if it is an OTB BL3.9 or a ZiPhone 3.9, then no.

**donky** · 03-04-2008 07:46 AM

ok so then so this is useless for the majority of us right?

**drg** · 03-04-2008 07:55 AM

Originally Posted by donky

ok so then so this is useless for the majority of us right?

I will admit that this is not usefull to a lot of people who have an OEM BL3.9. However, many heeded to warnings not to downgrade from BL4.6. Anyone buying a new iPhone should now use BL3.9FakeBlank when downgrading.

However, this is a technological feat, and another chapter in the history of unlocking the iPhone. So far it's been quite a ride

**yogi183** · 03-04-2008 08:28 AM

Thanks aCujo, great tutorial!
i was following the 3.9 NOR thread

very glad i retained my 4.6.

**dtube** · 03-04-2008 08:45 AM

This BL3.9FakeBlank is very very important to those having 4.6BL and wanted to downgrade to 3.9.

Prior to this, ziphone is used to downgrade 4.6 to 3.9 BUT once that is done, you cannot upgrade back to 4.6 if you want to. A lot of arguments have been posted in the forum and etc ...

Acujo's method of using the 3.9FakeBlank allows you to downgrade 4.6BL and it will allow you to go back if you ever want to. This is much better than ziphone.

Like drg said, no one is encouraging you to downgrade BL or telling you not to do it. It's your choice but everyone should select the better method/alternative that's available to you.

**)law(** · 03-04-2008 08:53 AM

Originally Posted by dtube

This BL3.9FakeBlank is very very important to those having 4.6BL and wanted to downgrade to 3.9.

Prior to this, ziphone is used to downgrade 4.6 to 3.9 BUT once that is done, you cannot upgrade back to 4.6 if you want to. A lot of arguments have been posted in the forum and etc ...

Acujo's method of using the 3.9FakeBlank allows you to downgrade 4.6BL and it will allow you to go back if you ever want to. This is much better than ziphone.

Like drg said, no one is encouraging you to downgrade BL or telling you not to do it. It's your choice but everyone should select the better method/alternative that's available to you.

perhaps someone could could wrap this up in a nice new repackaged ziphone and save the day?

**dtube** · 03-04-2008 08:59 AM

If you follow the many threads in the forum. Someone is working on a modified version of ziphone that does the "basic" stuff, with some enhancements such as afc2 patch, ssh, bsd and etc ... I've PM that special person to see if he can include the BL downgrade to use the 3.9FakeBlank. Hopefully it will happen. We sit and wait..