Yes, I reinstalled the native 2.1.2 again for sure (fresh download). The camera and the installation process behave quite probabilistically. Sometimes the whole firmware installation hangs up (with red LED on) before the sensor cleaning in the boot process could start and the camera becomes unresponsive, only battery reset helps. Sometimes the ML installation process seems to finish normally, red LED is off and the sensor cleaning cycle starts ... then nada. In this case the camera is responsive, and when I bring up the Canon menu it says that current firmware is "2.1.2-ml". The ML menu, however, cannot be actuated by the trash button. When resetting (off-on cycle) the firmware reverts to the original 2.1.2. No idea.