MB Star diagnose C4 firmware update

Why the firmware of MB STAR DIAGNOSE C4 need to be updated or downgraded when you use another version software?
Because different version of software need different version of firmware in MB STAR C4. Pls watch and know how to do update or downgrade. The link is
www.go2obd.net/...

[@TaukeMy]

Hi i got problem with my c4,can u help? When i put to w203,its working,but if i put to w204 come out : N93 - Central Gateway (CGW) (ZGW]) 😣

[@kellsautos9183]

I have connections issues with mine

[@ukaszjurys2475]

what sort of issue ???