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Tools, courtesy of Rajkosto:
https://switchtools.sshnuke.net/
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Get & extract HacDiskMount to a folder.
Get & extract TegraRcmSmash to a folder.
Get & extract biskeydump.zip's "biskeydump.bin" to TegraRcmSmash's folder.
Get & extract memloader.zip's "memloader.bin" to TegraRcmSmash's folder.
Move all of your SD files to their own folder on the SD root.
Extract the "memloader.zip\sample\" files to the Switch's MicroSD root.
[[ If you don't have an SD reader, you can use TegraRcmGUI's "UMS Tool" to hook into the SD card, alternatively. ]]
Put Switch in RCM mode if not already.
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[[ To use .bins with TegraRcmSmash, drag and drop them onto the .exe while the Switch is in RCM mode. ]]
BIS Keys:
Send the biskeydump.bin payload to your Switch.
Copy down your BIS Keys or use a QR scanner to email them to you.
Power off back to RCM.
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HacDiskMount to wipe installed Titles from NAND:
1. Send the memloader.bin payload to your Switch.
2. On Switch, navigate with Volume - / + to ums_emmc.ini and launch it with Power
3. Open HacDiskMount as Administrator, File > Open Physical Drive - Select [ Linux UMS disk 0 (29.121 GiB) ]
[[ On Windows, if after launching the ums_emmc.ini ... in Windows's Device Manager, if you see a device with a yellow exclamation mark - Right-click and uninstall it, then click the "Scan for Hardware Changes" button / menu option in order to get it to appear properly. ]]
4. Select the SYSTEM location, open it.
5. Paste the contents of BIS Key 2; if mismatch, write them by hand.
6. Set a drive letter, mount it.
7. Go to the mounted drive on your PC, open it.
8. Open the SAVE folder, #DELETE# everything EXCEPT for [8]000000000000[120]
9. Go back one directory, go to the USER folder... #DELETE# everything.
9. Dismount the drive in HacDiskMount, power off your Switch.
10. Resend the memloader.bin payload, select ums_sd.ini to boot into SD mode.
11. Move your SD files back to root. Rename Nintendo folder temporarily, or you will be asked to format SD when using the Switch.
12. Hold Vol- while you boot your normal payload with TegraRcmSmash. Boot Stock Firmware. System Initialize / Reformat your Switch (Settings > Bottom) just to make sure you're fine.
13. Resend memloader.bin, select ums_sd.ini, delete the new Nintendo folder, rename yours back to Nintendo.
14.
Boot Stock Firmware again [ Booting CFW might leave logs, only boot stock! Make a NAND Backup if you want to avoid this in the future. ]
15. Install your stuff again if its legitimate, otherwise do what you want before you pollute your NAND with detectable CFW junk.
- Done -