Re-installing magic lantern

[made3]

Hi.

I have a 5d mk2 (2.1.2)  magic lantern (ML) isn't initiating/loading any more.  I'm using the same CF card with the firmware files installed as per the instructions that I have had success with previously.  The other day it just stopped working and the regular canon firmware is the only software working on the camera.

Can I just re-install the ML firmware and run it again as I did previously to use ML?

Any advise to get my ML working again would be fantastic.  Cheers