unable install ML on another card (550d)

[doncizek]

I have installed ML on first sd card and its working fine, cards where ML wasn't installed are also warking fine. But when I install ML on another card (exactly following guide - both ways: with EOScard or by updating firmware), camera is not booting OR is freezing whille loading firmware. Card is bootable and there is autoexec.bin and firmware file (checked in EOScard). Sad thing is, when i uninstall ML from that card by EOScard, the card remains unusable. I tried already 4 different cards and always after install of ML, card is not booting in camera and after uninstall of ML from card, camera is still freezing on startup. Only thing that works, is uninstaling of ML form camera and then using all cards without ML OR using only the first time ML installed card.

I would be very greatful for any advice. thank you