Hacking Downgrade with Hekate

[lupus77]

Hi,

I haven't used my switch in a while and I am seeing lots of options like emummc and stuff now.

I have an old backup with Firmware 4.x, probably created by an older version of Hekate. It consists the following folders:
BOOT0
BOOT1
Dumps
Partitions
pkg1
pkg2
Restore (This folder is empty)

and a single file: rawnand.bin

My idea was to restore this backup and have a clean system for online play and use emummc for all different stuff.

If I recall correctly there has been some versions where the backups were flakey. Can I test my dumps if they are ok?

Should I also use an older Hekate version for restoring a backup?

Thanks.

 

[youngc29]

You shouldn't need to use an old version of hekate.
You can restore but make sure you leave Autorcm enabled so as not to burn anymore fuses like I did.
If using a later version of hekate pop in a blank exfat sd with nothing but the fresh sd files like kosmos/atmo boot into hekate and do a restore it will then not find anything ofcourse but will generate /backup/8digitserial/restore folders. Put the sd back in pc copy over your rawnand.bin and boot0/1 to the restore folder.
Put it back in inject the latest payload from hekate and restore nand. (Keep Autorcm enabled) and you should be good.
I think the above is correct.
You can then change over to fat32 2 partiton and create an emummc.

 

[Kafluke]

Most important question. Did you preserve your fuses? Does your fuse count match the version your trying to downgrade to?

 

[lupus77]

Thanks for the info about the 8digitserial, I wondered about that one as I have no 8digitserial as of now.

Am I right my gamesaves will be overwritten, too? I better make backups of them and restore them after setting up my emummc.

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Most important question. Did you preserve your fuses? Does your fuse count match the version your trying to downgrade to?

I did. Updated via choidujournx and autorcm enabled.

 

[youngc29]

I used checkpoint for the gamesaves, the question above about the fuses is important though.

 

[Kafluke]

Check your fuse count in hekate before you do anything. If you downgrade and your fuses dont match you'll be forced to use a custom bootloader everytime you turn on your switch until they match again.

 

[youngc29]

Kafluke, this is what happened to me, I read some shit about disabling Autorcm and my jig failed but hey shit happens, I can still boot now at least.

 

[lupus77]

Number of burnt fuses is 5. Should be ok for 4.x downgrade. At least this site says so: https://switchbrew.org/wiki/Fuses#Anti-downgrade

Edit: Just a follow up. Downgrade and creating emummc worked perfectly. Thanks everyone!