The game IS impossible to complete, once you get to the final battle, the boss is invulnerable, and you get one hit KO'd the moment the boss hits you, but that's not all. You'd get instantly thrown out of the battle, back into World 1 with ALL your progress deleted. While you can get the game...
There's something crossing my mind as of late, my unpatchable v1 Erista switch is yet to be banned, I keep a dual setup with CFW Emunand and clean Sysnand.
However, I know that as soon as I were to use my Emunand online I would be instantly banned. Assuming an unpatchable v1 Erista is banned...
Hold SELECT on boot, see if "show nand in system settings" is ticked, if not, tick it.
Enter system settings, if it says SYS 11.X.X.XX-U/E/J it means you're running CFW on sysnand (physical board), copy everything on the SD card to the new SD card. They have to be used on the same console...
To my end-user interpretation of your explanation, it basically means that activating the anti-wear patch just prolongs your 3DS wi-fi chip lifespan. Due to the way the DS mode is handled, it's designed to eventually fail once the chip is unable to write itself over with the information it needs...
The PSTV also faced this issue, and to this date even with hacks some games are completely unplayable on it due to lacking features (Uncharted: Golden Abyss)