well glad its sorted, but if your buddy is considering a XL or is from another region the serial codes differ, this is the link from the first post which contains pretty much everything someone would need to know to find a 4.x console
http://wiki.gbatemp.net/wiki/3DS_ha...the_System_version_before_buying_a_new_3DS.3F
but on a side note you broke the record for highest serial running on 4.x
you either got really lucky and picked up a console that had its motherboard swapped with a 4.x motherboard or your just the first to get such a high serial number to confirm they come with 4.x