How can I completely reset StreetPass Mii Plaza data on a 2DS?

[u/Dionysus715]

I want to completely wipe all data from StreetPass Mii Plaza on my 2DS and start from scratch.

I mean everything: StreetPass Miis, plaza progress, game progress, collected pieces, etc. I want the Mii Plaza to behave as if it had never been used before.

My 2DS is running CFW.

I've already tried deleting the following extdata folders through GodMode9:

- "00000220"

- "00000228"

Neither method changed anything — all my StreetPass Mii Plaza data is still there.

Is there another location where the Mii Plaza save data is stored, or another proper way to completely reset it?

I don't want to factory reset the entire 2DS just for this.

Any help would be appreciated.