Hacking Question Downgrading within same e-fuse set

[metaljay]

Is it possible to downgrade within the same fuse group?
E.g 3.02, 3.01 to 3.0?
Or 4.0 to 4.1?

I get you can’t downgrade if burnt fuses but not each firmware has different fuses

 

[Draxzelex]

Yes, use ChoiDujourNX or a NAND backup to downgrade within the same fuse set and you don't have to worry about fuses being burnt if you boot OFW without RCM.

 

[Boomerams]

Technically, you can still downgrade even if fuses are burnt. You will just have to put it in RCM everytime with a payload to get it to actually boot.

 

[Boot_8046]

3.0.0 has 3 burnt efuses, 3.0.1/3.0.2 have 4 burnt efuses.
But to answer your question, yes, it's possible, I've done it once too (2.1.0 to 2.0.0).

 

[metaljay]

Sorry I wasn’t clear, I don’t want to use RCM every boot. essentially I’ve read the potential exploit will work under 3.01fw, my friend has 3.02 so was going to legit downgrade.

How do I do it?

 

[shchmue]

use ChoiDujourNX https://gbatemp.net/threads/choiduj...ller-homebrew-for-the-nintendo-switch.513416/

here are the fuse groups http://switchbrew.org/index.php?title=Fuses#Anti-downgrade
if you stay within the same fuse level you don't have to use AutoRCM