I'm going to mod my switch soon, and plan to do everything inside emuMMC. However, recently I've played a lot of Breath of the Wild on Cemu and would like to transfer the save to my Switch.
I'm thinking about starting Atmosphere on the sysMMC once to run Checkpoint (or some other save manager)...
Don't use Gateway anymore, if you mess up and use it on 11.3 you'll either brick or lose CFW.
You can convert all your games to CIAs and all your saves to work with the CIAs.
I've gotten the same issue you had with guiformat, and the fix is simple. Close all windows explorer windows before you format the drive. It should work now.
Bare minimum: 3ds folder, luma folder, Nintendo 3DS folder, boot.3dsx, and boot.firm.
But, you should copy everything on the SD card just to be safe.
Reminder that the new SD card has to be formatted as fat32.
I like this so far, but I think the double banner kind of ruins it. Maybe add an option that just has one banner?
(also it doesn't like my DSTT)
One more thing:
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi