Hardware My inability to comprehend fuses. (Help)

[DesuDemon]

So to start off Hi I'm Desu I'm brand new to the forums. I am very interested in all the work you guys do and decided upon myself to buy and rcm jig and dive headfirst into this world.

I followed a guide on backing up my sysNAND (thank god) loaded up atmosphere and immediately went for a very specific application that I am not fully aware or not if I can talk about. I tried to load said program and it failed so being the idiot noob that I am (did I mention I used to hack psp's back in the day wow not the same at all) I figured with my massive brain "ah I have 11.0.0 It must be that it is incompatible with this fw and I need the next step down"

Yeah this is where it gets good, I immediately use Daybreak to lower the fw on my switch to 10.2.0 thinking this is the answer. The launch fails and I get error codes. Well silly me if i would've done more REASEARCH I wouldve known I needed to he in autoRCM mode through heckate. I knew that doing this unsafely has caused me to burn "fuses" I quotate that because being a noob I am still unaware exactly how they work. I knew one thing for sure though..that I made a stupid mistake right out the gate. I panicked I didn't know what I just did but I knew that I needed a specific number of fuses burnt to go back to my backup file.

It was 14 fuses burnt so I was able to revert to 11.0.0 and copied my OG files back and am now insanely scared of coming back to this, however I feel I could do some really fun things with the cfw. I love my switch I backed everything up and used 90dns to protect myself because I can't lose online I would be devestated.

What I am asking is can someone please help me understand how fuses work? If I burn them should I cut my losses and make my current switch into an emulator box and buy a new one? Does this mean if I ever update to newer ofw will I have to boot with Heckate forever? I'm scared because I'm ignorant but I so badly want to learn.

Thanks everyone please be kind

 

[FR0ZN]

eFuses are embedded in the CPU and are "burnt" by Nintendo with every new update.
This is done to prevent the users to revert to a lower (potentially comprimised) firmware.
Each firmware expects a certain fuse count for it to boot - if the expected fuse count doesn't match with whatever is inside your CPU, then the system will not boot.
The only way to boot into a lower firmware while having a higher burnt fuse count, is to use a CFW, which skips the fuse check.

 

[DesuDemon]

eFuses are embedded in the CPU and are "burnt" by Nintendo with every new update.
This is done to prevent the users to revert to a lower (potentially comprimised) firmware.
Each firmware expects a certain fuse count for it to boot - if the expected fuse count doesn't match with whatever is inside your CPU, then the system will not boot.
The only way to boot into a lower firmware while having a higher burnt fuse count, is to use a CFW, which skips the fuse check.

Thank you so my big question is if I update to a new firmware when its released will I have to make a sysNAND backup up of it to restore to ofw? and is there a faster way to switch between ofw and cfw without drag and dropping a 32 GB back up NAND.

 

[Hayato213]

https://switchbrew.org/wiki/Fuses

scroll down to the bottom for the expected fuse burn for each firmware, as for OFW and CFW, if both of them are on Sysnand then the NAND is considered dirty, if you have a clean NAND you can make an emunand and do all your CFW stuffs there and keep the Sysnand for online play.

 

[DesuDemon]

[QUOTE/]scroll down to the bottom for the expected fuse burn for each firmware, as for OFW and CFW, if both of them are on Sysnand then the NAND is considered dirty, if you have a clean NAND you can make an emunand and do all your CFW stuffs there and keep the Sysnand for online play.[/QUOTE]


Ah I see so you have to partition your sd to utilize both quickly. I'll need to get a larger than 64 GB sd card then.