600RT Flash bug in new Canon 5DIII firmware.

Started May 12, 2013 | Discussions thread
MASTERPPA
Contributing MemberPosts: 864
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Re: 600RT Flash bug in new Canon 5DIII firmware.
In reply to PGSONY, Jun 17, 2013

You cant as far as I know. You have to have a copy of the firmware upgrade form Canon. I was lucky and someone send me a link to a copy.  But that was a month ago, and I am sure Canon took down all the old firmwares

PGSONY wrote:

How can I backup my current firmware? -- this is the first time I am doing this so compeltly clueless! Thank you!

MASTERPPA wrote:

Canon has not gotten back with me. yes, since I have the older firmware and the AF in dark, with IR is a little slower. But at least I know the flash will fire. Keep a copy of the old firmware (if you can) and install the new. If you see the problem, downgrade the firmware. I downgraded the firmware with no problem.

PGSONY wrote:

Hello,

I was researching about this issue and came upon this thread. I have the same issue where I can't focus in a reception hall using a 5dm3 & 600ex rt.. It is sometimes so slow that I end up missing very important shots. A lot of websites are saying to install the new firmware, but now I am worried this firmware update will make it worse after reading the comments above. Has there been any more updates since then? Should I try to update -- I don't want to be in a worse situation after the update.

Thanks!!

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