whats the gap bios and cutting traks for?
like for the messiah it says for the v4 (USA) Only GAP BIOS V4

Only time u would be cutting tracks is for neo seris mods..like neo4, neo4.1, neo4.5...

Messiah doesn't need any tracks cut....

U have to check ur bios chip, to verify if there is a gap or not, that will tell u which modchip is compatible with ur ps2...

The bios chip will either have a little space in between the pins or not...

Here, see for urself: http://image.lik-sang.com/content/neo45/neo45_installation.htm

At the top of that page u can see gap and no gap bios...