wooow, really great job. i have a not working 357b (board Ver001). Also i have a working PS3 cechL04 with the same motherboard as 357b. Do you think i can use joonyies GEX CFW 4.7 for my PS3 cechL04 to convert it to GEX or do i need to use a ps3 slim cech2504 like you did?