Hacking Question Can I downgrade without a NAND backup?

Jellykrop · Feb 24, 2019

Hi,
My external hard drive decided to go skydiving without a parachute and I just lost my 4.0.1 NAND backup that I did before upgrading to 6.1 using ChoiDuJour, and I would have liked to re-do one.

My Switch is currently on 6.1 with autoRCM enabled. I was wondering, can I downgrade to 4.0.1 without a NAND backup using Choi, disable autoRCM (since it corrupts boot sectors, if I'm correct) and then do a NAND backup of my Switch on 4.0.1 before upgrading it again to a higher firmware (6.1 or 6.2)? My fuse count is 4, my Switch came on 4.0.1 and was never updated officially.

I would rather ask the community before doing anything dumb and complaining of a brick right after

Thanks!

Kubas_inko · Feb 24, 2019

You can downgrade via choidujourNX.
Also, you can upgrade to 7.0.0/1 (but there is no difference yet if you stay on 6.2.0)

Jellykrop · Feb 24, 2019

Kubas_inko said:
You can downgrade via choidujourNX.
Also, you can upgrade to 7.0.0/1 (but there is no difference yet if you stay on 6.2.0)

Alright, but is the method I described feasible? I wasn't sure I could downgrade without a NAND backup safely (only using ChoiDuJour)

Kubas_inko · Feb 24, 2019

Jellykrop said:
Alright, but is the method I described feasible? I wasn't sure I could downgrade without a NAND backup safely (only using ChoiDuJour)

I told you yes. You can use choidujourNX to downgrade to keep your stuff or use choidujour to rebuild your NAND and make it clean.
Downgrade via choi -> remove autorcm -> do a backup -> do whatever else you want. But, it won't be considered a clean backup (depending on what were you doing on your NAND).
If you want to rebuild your NAND, thus make a clean NAND, you can use normal choidujour, but you would lose everything on your Switch.

Jellykrop · Feb 24, 2019

Kubas_inko said:
I told you yes. You can use choidujourNX to downgrade to keep your stuff or use choidujour to rebuild your NAND and make it clean.
Downgrade via choi -> remove autorcm -> do a backup -> do whatever else you want. But, it won't be considered a clean backup (depending on what were you doing on your NAND).
If you want to rebuild your NAND, thus make a clean NAND, you can use normal choidujour, but you would lose everything on your Switch.

Oh I get it now, thanks. And what is the difference between a "clean" backup and a normal one? Am I going to get in trouble later when restoring it? I never done any customisation to my Switch besides updating using Choi, running a CFW and a few homebrew apps.

Kubas_inko · Feb 24, 2019

Jellykrop said:
Oh I get it now, thanks. And what is the difference between a "clean" backup and a normal one? Am I going to get in trouble later when restoring it? I never done any customisation to my Switch besides updating using Choi, running a CFW and a few homebrew apps.

Clean one has no traces of any "warez" activity. It is just like a brand new switch NAND. Nothing installed. Nothing changed.

Jellykrop · Feb 24, 2019

Kubas_inko said:
Clean one has no traces of any "warez" activity. It is just like a brand new switch NAND. Nothing installed. Nothing changed.

I see, thanks for your help

Zumoly · Feb 24, 2019

Also it doesn't hurt to have more than one backup. Why not do one of your actual fw?

Jellykrop · Feb 25, 2019

Zumoly said:
Also it doesn't hurt to have more than one backup. Why not do one of your actual fw?

Great idea! I'm gonna do both.

--------------------- MERGED ---------------------------

When I backup my boot partitions with Hekate while autoRCM is still enabled, does it backup the corrupt ones or the clean ones?

Zumoly · Feb 25, 2019

Jellykrop said:
Great idea! I'm gonna do both.

--------------------- MERGED ---------------------------

When I backup my boot partitions with Hekate while autoRCM is still enabled, does it backup the corrupt ones or the clean ones?

It will backup the current state: corrupt ones
Unless of course you deactivate it for that purpose.

Jellykrop · Feb 25, 2019

Zumoly said:
It will backup the current state: corrupt ones
Unless of course you deactivate it for that purpose.

Ok thanks

My NAND backup of 6.1 just finished, I'm about to downgrade to 4.1 and do the same thing again.

Jellykrop · Feb 25, 2019

Huh... this is bad... I just downgraded from 6.1 to 4.0.1 and now when I click on "boot CFW" on SX OS it shows the Nintendo logo, then "an error has occured" and it shows me my serial number and my firmware version "4.0.1" and nothing else... How can I recover from this please?
Error code : 2002-4315

Jellykrop · Feb 25, 2019

Hi,
I just downgraded from 6.1 to 4.0.1 using ChoiDuJourNX (no fuses were ever burnt, my fuse count is 5 and the Switch came with 4.0.1 out of the box).
Now when I click on "boot CFW" on SX OS it displays the Nintendo logo, then "an error has occured, Error code : 2002-4315" and it shows me my serial number and my firmware version "4.0.1" and nothing else... How can I recover from this please?
I have a NAND backup of 6.1 that I did before downgrading, and access to Hekate, but autoRCM was enabled so I don't know if my boot partitions are valid...

Kubas_inko · Feb 25, 2019

Just out of curiosity, try different CFWs.

Kafluke · Feb 25, 2019

Jellykrop said:
Huh... this is bad... I just downgraded from 6.1 to 4.0.1 and now when I click on "boot CFW" on SX OS it shows the Nintendo logo, then "an error has occured" and it shows me my serial number and my firmware version "4.0.1" and nothing else... How can I recover from this please?
Error code : 2002-4315

What did you do to downgrade? Did you use a nand backup? Did you also flash boot0 and boot1? You need both of those to downgrade properly.

https://gbatemp.net/threads/psa-sto...ou-know-what-youre-doing.531861/#post-8520674

blahblah · Feb 25, 2019

Update to 6.1.0. SxOS has issues with downgraded systems that are on very old versions.

Jellykrop · Feb 25, 2019

Kafluke said:
What did you do to downgrade? Did you use a nand backup? Did you also flash boot0 and boot1? You need both of those to downgrade properly.

https://gbatemp.net/threads/psa-sto...ou-know-what-youre-doing.531861/#post-8520674

I used ChoiDuJourNX, browsed the 4.0.1 firmware folder containing NCA's, installed it and turned off the console. Then when booting I held vol+ and inserted my dongle, the SX OS boot screen showed up, and I clicked on "boot CFW", then this error message appeared.

Jellykrop · Feb 25, 2019

blahblah said:
Update to 6.1.0. SxOS has issues with downgraded systems that are on very old versions.

I only wish I could, but I don't have access to ChoiDuJour since I cannot boot into CFW.

blahblah · Feb 25, 2019

Jellykrop said:
I only wish I could, but I don't have access to ChoiDuJour since I cannot boot into CFW.

Boot Atmosphere.

Jellykrop · Feb 25, 2019

blahblah said:
Boot Atmosphere.

I will give that a try, thanks. Just wondering, in order to boot into atmosphere, should I remove the boot.dat file from SX OS and replace it with Atmosphere's? I am using a Mac, so no payload injector for me, I am relaying only on the SX Pro dongle.

Hacking Question Can I downgrade without a NAND backup?

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