if you use modmii , it generates
tutorials for you to your specific needs , priiloader is among other things part of brick protection , allowing you to use any region and block online and disc updates , allowing you to play anything , on the SM your currently on , theres no benefit to upgrading to 4.3 .
MODMII gba page :
http://gbatemp.net/t...-support-topic/ youll find links also to modmii's homepage. Priiloader can be obtained through modmii... i suggest reading that thread and the modmii pages , see if you understand it , if not come back here to ask for clarity.