Lately i get problems with modchips like Drivekey/Flatmod/Wiikey2. We have modded lots of wii systems. All original games work without any problems. Lots of back-ups gives problems when booting/playing. I can't find the solution. I use drivekey and flatmod for several years and I never faced this problem before. I allmost tried everything. Tried different chips, tried different wii dvd drives, fix software by downgrading to 4.1. Modchip is isolated. Problem i get at 5 different wii systems. Wii consoles are PAL systems and I only use PAL scene released, burned the games with different PC's using Pioneer writers, IMGburn/CloneCD, Verbatim DVD-R and maximum write speed 4x. Games that say can't read disc at booting are Call of duty and mario kart. All other games crash at boot or while playing. I think the problem is the black ops game update, but I don't know how to remove this update from the wii system.