Is there a UnsafeNandManager that ignores CID to restore NAND?
(NAND of original console)
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If Unlaunch is not installed, and DSi system error.
Backup or Restore NAND OK:
Start GodMode9i(SD>ntrboot.nds) with ntrboot,
then start SafeNandManager1.1.1 in GodMode9i to Backup or Restore NAND.
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If GodMode9i error.
Backup NAND OK:
Start dsibiosdumper(SD>ntrboot.nds) with ntrboot(quickly move magnet away at boot), dump NAND.
Manually add no$gba footer:
Copy 000FF800 to 000FF830 64 bytes(DSi's CID), add these 64 bytes at the end of the nand.bin.
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Start SafeNandManager(SD>ntrboot.nds) with ntrboot.
Or Start HBMenu(ntrboot.nds), then SafeNandManager.
Backup NAND NG:
If not installed Unlaunch or NAND has been restored before, Backup NAND no CID.
Restore NAND NG:
DT000 folder, NAND with or without no$gba footer, SafeNandManager cannot be Restore.
If NAND in DT***(DSi CID)folder, SafeNandManager does not show Restore option.
I tried several times, sometimes NAND backup have FF800(FF810 all 00 = no CID) without no$gba footer, sometimes NAND backup have no$gba footer(no CID) & FF800 to FF830 all 00.

If NAND backup have no$gba footer(no CID), SafeNandManager(SD>ntrboot.nds) Restore NAND is OK.
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If NAND backup have FF800(no CID), without no$gba footer.
Manually add no$gba footer(no CID):
Copy 000FF800 to 000FF830 64 bytes, add these 64 bytes at the end of the nand.bin.
Put nand.bin in SD card DT0000000000000000 folder.
Start SafeNandManager(SD>ntrboot.nds) with ntrboot, Restore NAND.