Hacking Question Is boot0/1 console specific?

[Bst22322]

I have my original rawnand backup back when I used hekate 2.3(?)
It did not have the option to dump boot0/boot1 at the time
I have saved my fuses using choidujournx and currently am at 6.0.1
Can I downgrade using my rawnand backup without boot0/1? I thought these were firmware specific.
If so, then how do I create boot0/1 files for firmware 4.1.0?

 

[AndyGJorgensen]

Yes boot0/1 are firmware and console specific
I believe you can download 2.3 firmware and use choidujournx to downgrade the same way you upgraded.

 

[Bst22322]

Yes boot0/1 are firmware and console specific
I believe you can download 2.3 firmware and use choidujournx to downgrade the same way you upgraded.

So I'd want to downgrade to fw 4.1.0, then backup boot0/1, then restore backup of 4.1.0 using the newly dumped boot0/1 files?

 

[AndyGJorgensen]

Let someone who knows for sure answer this to but it is my understanding that you can downgrade and that would downgrade your boot files allowing you to get the correct boot files

 

[OrGoN3]

So I'd want to downgrade to fw 4.1.0, then backup boot0/1, then restore backup of 4.1.0 using the newly dumped boot0/1 files?

Downgrade in ChoiDujour. Backup boot0/1. If you want, you can then restore 4.1.0 via your backup, or just upgrade again using ChoiDujour. What is your end goal?

 

[TR_mahmutpek]

It should not console specificbut I'm not sure. Maybe you can try install same firmware via Chodjur.

 

[Raugo]

Only boot0 have some console specific data the boot1 is the same for all the consoles with the same firmware. You can recreate the 2.3 boot0 with a donor boot0 of this firmware and your actual boot0. In the offset 0x180000 are all of your console keyblobs and in the offset 0x450 the keyblob of the actual firmware.

 

[Bst22322]

Downgrade in ChoiDujour. Backup boot0/1. If you want, you can then restore 4.1.0 via your backup, or just upgrade again using ChoiDujour. What is your end goal?

I'm just trying to prepare for the eventual warm boot exploit. Restoring my backup or not is trivial, I just thought you could not downgrade using choidujournx without boot0/1
If I can downgrade without boot0/1 files I am all set

 

[shchmue]

Raugo is correct, ChoiDujour doesn’t touch the console unique part of BOOT0 and downgrading to your original firmware and then backing up is a good idea but having any backup of BOOT0 is better than no backup!

 

[chippy]

The issue with boot 0/1 is when restoring a nand backup, but downgrading with a "system update" will create the boot 0/1s needed for that version if I understand it correct. Someone can correct me if I am wrong

 

[Khar00f]

From my experience as i did a restore two days ago.

Restoring the NAND without restoring Boot0/1 will cause your system to crash on boot.

 

[shchmue]

The issue with boot 0/1 is when restoring a nand backup, but downgrading with a "system update" will create the boot 0/1s needed for that version if I understand it correct. Someone can correct me if I am wrong

Choi only replaces the pkg1 part of Boot0, the keyblobs are left alone

From my experience as i did a restore two days ago.

Restoring the NAND without restoring Boot0/1 will cause your system to crash on boot.

this is true if on a different firmware version, Boot0 contains the pkg1 firmware that's supposed to run during boot and that changes in many firmware updates, if those don't match the current installed firmware that's on the rest of the NAND, it absolutely will not boot.

 

[osbodav]

How does one use another persons boot1/0 mine was curropted and used someone elses and doesnt boot, i have all my biskeys