Error 30 after installing ML

[mateosonic]

Hello,
This morning I upgraded my Canon 5D ml II to 2.1.2 so I could install latest version of ML (2.3.5)
I followed all steps from Canon firmware update manual and the same for ML installing.
All install process went ok. I restarted my camera, tried to shoot but ERROR 30 screen came out.
Checked all around the web, this seems to be a shooter hardware or electronical problem, and is a very common issue with 5D, the main difference in my case is that most of the other people got this error message after being shooting for a while.
In my case, I've just shooted once befor upgrading the firmware, and everything worked perfectly.
No luck with any reasonable home-solution for my problem (hiting camera a little bit on the bottom, turn on manual sensor clean, multiple shoots)

I am very sad! fixing it is really expensive in my country, and buying another one is impossible

[scrax]

Have you tried without a card? O with another lens? I had  a similar (meccanical) problem on with my 17-85mm still under warranty and canon fixed it.

Err 30 - Malfunction related to the shutter has been detected.