Dont use the 9.2 update packs, instead use the 9.0 from that iso site(it's actually 9.1). Believe me, coz I have a japanese n3ds too. see my sig
Yellows8 published a browser nag workaround for o3ds and n3ds a few weeks ago.But dont you get the update nag on 9.9 and are unable to access the browser?
Does browserhax even work on 9.9?