Yes. I used systemupdater to update my 3ds and then I used safesysupdater to downgrade to 9.2. I did this on my oOk, so you basically placed sysUpdater and 10.3 fw from that ISO site, then accessed HBL through browserhax or other similar method and started the Sysupdater program. And after that you did the same but this time with the update folder of 9.2 FW right?
O3DSXL that was on 10.2 and on my N3DSXL that was on 9.9. My last O3DSXL where already on 10.3 so I went for the downgrade immediately.