FIXED: T3i upgraded to Firmware 102 (for ML 2.3.5 install) WILL NOT BOOT

[upthinklab]

After installing the Canon firmware 102 (per ML directions) to allow the install of ML v2.3.5, the camera will no longer boot with a SD card installed. If I remove the card, it will boot just fine and I can confirm the 102 firmware is properly installed. However, whenever a SD card is inserted, it will not boot and flashes the red light. Removing the battery resets, but the problem continues. I have tried with 5 different SD cards, so the SD doesn't seem to be the problem.

Has anyone else experienced this? I was excited to try the new v2.3.5 for the Perseid show this weekend, but now it feels like my T3i is bricked.

Thanks!

[upthinklab]

Update: The problem was that the SD card was not properly reformatted (i.e. using Disk Utility). Upon a proper format using OSX, everything is working again. What a relief. ;-)

Apologies if I scared anyone.

[Datadogie]

It's always good that you let us (others) know you solved problem and how.  Thanks.

[scrax]

To me that seems not a Volume problem, instead looks like your card was made bootable but without an autoexec.bin on it to boot, formatting it solved the problem because your card was not any more bootable.

I don't know, where you found ML 2.3.5?

In future (and alsop in general) is really better to format card on camera to avoid problems.
I've never ever used DiskUtility to format EOS card (a part for having them ExFAT for g3gg0's test,).