Hello friend, I saw your post here and I need your help I have 2 interface diagbox an old 9780.z5 that was serial number B that diagnostics with diagbox 5.01 in old cars normally and by accident I changed your serial to C until then does not work more, and I have a new 1281 z serial C that I use with diagbox 7.46 for newer cars that is not working with either old or new cars, could you help me solve this problem?
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