i have tested now the last released hacker kit with all the cheat devices included and there it works the gameshark v5. i couldn't rebuild it so far on new iso, so there must be some kind of lba protection or i have missed some files.
i will try and test further, so i can build a collective cheat iso with only the working ones. also there is a memorycard manager and renamer which also work.
for anyone who wants to try:
but only xploder v4, codebreaker v4, gameshark v5, importlauncher, memorycard manager and memorycard renamer are working. don't need to bother with the others...i have noticed, the non working ones have scrambled and unreadable main executables. maybe it is because of that. (the size is because of 2 big dummy files the author has included)