Leak here: http://www.romulation.net/NDS/4748_-_Pokemon_HeartGold_%28U%29%28Xenophobia%29.rar.html/
Latest firmware required for M3DS Real here: http://www.linfoxdomain.com/nintendo/ds/dl.php/M3G6_DS_Real_v4.7h_M65_Multi.zip
Latest firmware required for M3DS Real here: http://www.linfoxdomain.com/nintendo/ds/dl.php/M3G6_DS_Real_v4.7h_M65_Multi.zip