Hi, I've been using a Metz 54 mz4 with 3102 M2 module on my 20D for many years with no problem. However, when I tried it on my 7D, there was no eTTL II and no communication with camera. I can use the flash in Manual mode though.
Do I have to buy a 3102 M5 module, or maybe there is an option to upgrade a software on my old 3102 M2? I've heard it's possible, but I'm not sure.
I went to Metz site and there is nothing about 54mz4, and upgrade links come up as Error page.
