I've got a 3ds (first 6 months of NA distribution, so O3ds) running firmware version 10.3.0-28U. I wanted to downgrade to 9.2.
I've installed on my sd card
starter kit
sysupdater
9.2.0-20U(Full)
menuhax 2.2
For a while, it seemed I'd triggered the browser lock; I got the update nag message...