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magic v
:( i install a magic v in my ps2 v7 and the original games work good but i tried to play backups and no works told me insert playstation games.i check several times the instalation and all is good.i check the backups games cdr and dvdr in other playstation with no solder mod and works fine.thanks for your helps
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I know you think the install is solid, but there's something amiss there. A dry solder... a broken wire... something. Most likely not the bios (m - v), since originals work with the chip enabled.
I've seen a couple versions of schematics for the M5... each had differing contact points. Perhaps check some other supplier's schematics and try the differences.