Interesting. I would have to guess the flipped bit impacts a code path that will never run on your card. Perhaps it would have impacted the card if it was a different capacity nand chip but you got lucky.
By the way does your card boot properly from DSi System Menu? (it has to be soft modded with Unlaunch/HiyaCFW of coarse)
The Stage2 SRL for your cart has normal sized arm7 binary that is not loaded to the same place the normal stage2 SRLs the other N-Card clones use.
As such it actually manages to boot from DSi System Menu...partially. It fails to launch uDisk for some reason as that's what the one I recently got does and it appears to have identical stage2 binary that yours has minus the odd flipped bit.
You'll know if your card is doing the same thing as mine if you boot from DSi System Menu while doing the safe block mode key combo.
If you boot it while holding L+R+A+B+DPAD-UP you should see a USB Safe Mode D12 text on bottom screen with a build date at top of bottom screen. (that is also an notable difference between the other clones since all my other carts don't display a build date)
The boot issue with DSi System Menu can be resolved with ExpressCards as I was able to make the udisk updator NDS alter the first block table instead of the second one and this causes the main rom to boot the udisk section directly instead of the stage2 section.
I tested that with my bricked DS Linker though and it partially corrupted that section instead. I am not sure if it would work properly on the 8g N-Card you have (the label is also anotehr oddity in that it shows 1GB but unlike all the other clones it doesn't = 1Gigabit but the label indicates it as 1 Gigabyte)
My Dora bootleg cart I transformed back to a normal N-Card was another N-Card I could boot from DSi System Menu because it lacks a stage2 section entirely and as such the 1st block section is setup to point to 0x400000 region (where the second block section normally exists). A modified udisk updator/USB updator can put a rom there and in most cases would be bootable without having to mess with the block table.