Hacking Question Getting emuMMC working

Seelbreaker · Apr 11, 2020

Edit - could a Mod plaese change the title?
Getting emuMMC working with clean sysMMC for Online play

Hey there,

my Setup:
- unpatched Switch with sysNAND 8.1.0 working.
- 2 fuses are burnt
- i think i have never updated my gamecard because on that switch i can't boot gamecards within 8.1.0 CFW

- 400GB microSD fromatted with FAT32 for files and stuff
-- second primary FAT32 Partition for the emuMMC RAW Partition (29,2 GB) where my CleanNAND 2.1.0 is stored and working
-- emuMMC/SD00 within the microSD

- keys.bin and keys.dat are pretty much everywhere within the sd card because it grow over the time

- AutoRCM enabled
TegraRCMGui under Windows is used to boot up hekate_ctcaer_5.1.3.bin

My Goal:
- Get my current 8.1.0 sysnand onto a emuNAND/emuMMC and working/booting
- Install my clean OFW 2.1.0 Nand Backup to my Sysnand so that i can play online

And i've got a ton of questions ^^ Therefore i thought it would be easier to create a Thread.

So far i got emuMMC running, but only if i use my Clean OFW 2.1 NAND from a partition within the SD Card (Settings --> Console shows 2.1.0| AMS 0.10.4|E ).
So that works really fine but if

First of i would like to have the 8.1.0 running on a emuMMC so that i have my CFW safe but that doesn't work currently.
When i do a Nand Backup of my 8.1.0 Sysnand to the SD Partition or into a SD File it won't boot the emuMMC (i just created them freshly while doing this post because the battery needed to be charged anyways).

Raw-Partition Emunand is selected:

Bootup:
- Kosmos Splash Screen (USB Device then turns off within Windows)
- Blackscreen

So now i'm asking myself:
Should i just use my clean nand 2.1.0 as an emuMMC and use ChoiDujourNXv102 to update the emuMMC to 9.2.0?

Atmosphere is working under 9.2.0 right?

If that works, i then would bootup my 8.1.0 sysnand in CFW Mode and use ChoiDujourNX to downgrade the sysnand back to my 2.1.0 Cleannand so that my sysnand is clean for online play...

How should i then update my Sysnand to 9.2.0? Boot it up in CFW Mode (without Internet) and use ChoiDujorNX to upgrade it to 9.2.0?

- What about AutoRCM and my fuses?
- Wasn't there an update which disabled autorcm?
- So i need a jig so that no fuses are burnt, right?

Sorry for that many questions, but since i want to downgrade the sysMMC i want to be safe than sorry

BaamAlex · Apr 11, 2020

Seelbreaker said:
What about AutoRCM and my fuses?

Nothing. If you use autorcm, you will never burn any fuses

Seelbreaker said:
Wasn't there an update which disabled autorcm?

As of Atmosphère v0.8.0, the "ns" module is no longer granted write access to the BCT public keys, which prevents the BOOT0 from being fixed ("AutoRCM protection").

Seelbreaker said:
So i need a jig so that no fuses are burnt, right?

You use autorcm. Means, you don't need a jig anymore.

Seelbreaker · Apr 11, 2020

BaamAlex said:
Nothing. If you use autorcm, you will never burn any fuses

As of Atmosphère v0.8.0, the "ns" module is no longer granted write access to the BCT public keys, which prevents the BOOT0 from being fixed ("AutoRCM protection").

You use autorcm. Means, you don't need a jig anymore.

Thanks!

Emunand and everything is working fine, i started from scratch with the 200GB micro-sd card

When i update the sysnand on 2.1.0 (after initalization) do i need to use a specific order, or can i just get to 9.2.0 via ChoiDujourNX?

Seelbreaker · Apr 12, 2020

Alright,

after restoring Boot0 and Boot1 aswell as my rawnand.bin parts onto my sysMMC AutoRCM got disabled. So i had to get my jig, boot hekate_ctcaer.bin and enable AutoRCM.

Thx for the help!

Hacking Question Getting emuMMC working

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