I've tested all games again, now ALL of them are correctly dumped, even the problematic title "Klax" (that didn't worked in any firmware so far) is now correctly dumped AND working
For the "4-Mega-Games; her are the results:-Asterix - autodetection of the ROM size - working - 512KB
-Golden Axe - autodetection of the ROM size - working - 512KB
-Land of Illusion starring Mickey Mouse - autodetection of the ROM size - working - 512KB
-Sonic 2 - autodetection of the ROM size - working - 512KB
And the rest:-Castle of Illusion starring Mickey Mouse - working - 256KB
-Global Gladiators - working - 256KB
-Klax - autodetection of the ROM size - working - 128KB
-Ninja Gaiden - working - 256KB
-Sonic 1 - working - 256KB
-The Flash - working - 256KB
-The Lucky Dime Caper starring Donald Duck - working - 256KB
-Wimbledon - working - 256KB
-Wonder Boy III: The Dragon's Trap - working - 256KB
PS: "GoodSMS v3.2.0" still "didn't like" them