I've been busy trying to get the right sentence to create the files and i think I got it but it doesn't generate the *120 file.Use this https://github.com/suchmememanyskill/EmmcHaccGen
this takes the FULL lockpick keys (unlike choudijour, which made you delete a bunch to work right)
You have to install .net core 3.1 though https://dotnet.microsoft.com/download/dotnet-core/thank-you/sdk-3.1.202-windows-x64-installer
and it should work with almost any firmware, so you should be able to use whatever version your original backup was, then flash your backup with nyx along with the boot0/1 generated here. You should be able to boot sysnandcfw after that, launch choidujourNX, and upgrade to the latest.
umm... before you go and flash stuff, you might want to try memloader again and replace system/save/8000000000000120
This program actually creates one for you, and this file will absolutely prevent you from booting if it isn't there. I am now fascinated that I haven't heard of it before now. It's superior to choidujour.
in the screenshot you can see the overview of how it looks when the files are written.
When flashing the boot0 and 1 to my switch using hekate it tells met this:
Size of the SD Card backup does not match,
eMMC's selected part size!
Your backup might be corrupted!
Aborting is suggested!
Can continue and I did but it doesn't boot any of the launch methodes I try.
I've tried --no-extfat aswell, but doesn't work either.
When I look at the file size it looks like a blank boot and the folders are all empty:
Where a full boot file from my brothers switch (still working) is: