I just wanted to post this:
Thanks everyone for your help that answered my questions regarding backing up my Nand.
I was able to restore my Nand from Hekate v3.1 - I had all three files boot0, boot1, rawnand.bin.
I used Samsung MicroSD Ultra Plus 256gb when I backed it up and when I restored it. No issues and got to work first time.
I then was able to initialize the Switch online to remove the fake Nintendo account.
I was also able to go online to the eShop as well as update a real cart game online with no issues.
I am going to sell it as I have two other ones. My son has one and I have a new one I just purchased with 4.1 on it and do not want to hack it until further hacking development is released such as Atmosphere and EmuNand.
Link to Samsung MicroSD card.
https://www.samsung.com/us/computin...-w--adapter-256gb--2017-model--mb-mc256ga-am/
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The fuses are blown to prevent downgrades after you update your Firmware.
Not all firmware that is released by Nintendo may blow a fuse as it is used upon their discretion.
Link to fuse section Anti-Downgrade:
http://switchbrew.org/index.php?title=Fuses
Anti-downgrade
The first bootloader verifies
FUSE_RESERVED_ODM7 to prevent downgrading. How many fuses are expected to be burnt depends the device's unit type as below.
System version Expected number of burnt fuses (retail) Expected number of burnt fuses (non-retail)
1.0.0 1 0
2.0.0-2.3.0 2 0
3.0.0 3 1
3.0.1-3.0.2 4 1
4.0.0-4.1.0 5 1
5.0.0 6 1
If too many fuses are burnt the bootloader will panic immediately.
If too few are burnt, the bootloader will enable fuse programming and write the expected value to fuse indexes 0x3A and 0x3C. Afterwards, fuse programming is disabled and the panic value 0x21 is written to PMC_SCRATCH200 register (0x7000EC40). Finally, the watchdog timer is initialized and programmed to force a reset.
On a subsequent boot, after the anti-downgrade fuses are checked again, the PMC_RST_STATUS register (0x7000E5B4) is checked and if set to 0x01 (watchdog reset) the PMC_SCRATCH200 register (0x7000EC40) will be checked for the panic value 0x21. PMC_RST_STATUS will only be set back to 0 (power on reset) if the fuse count matches the new expected value, otherwise the system will panic.
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Any downloading of updates or DLC after you have run SX OS is a risk going online especially if you have used LayeredFS even in offline mode only.
You can get updates of games offline now - read up on this CDNSP.