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Canon has released new firmware for the Canon EOS R1. This firmware is identical to the latest firmware release for the Canon EOS R5 Mark II.
The firmware update addresses an autofocus bug along with optimization of the temperature warning feature.
Canon EOS R1 Firmware v1.0.2
- Optimized the timing when the camera temperature rise warning appears.
- Fixed an issue where the subject could not be focused during AF in certain zoom ranges

Overview
- 24MP Full-Frame Stacked BSI CMOS Sensor
- DIGIC Accelerator + DIGIC X Processing
- Dual Pixel AF with Action Priority
- Improved Eye Control AF
- 6K 60 Raw & 4K 120 10-Bit Internal Video
- Up to 40 fps, Pre-Continuous Shoot Mode
- 9.44m-Dot 0.9x EVF, OVF Sim. View Assist
- 3.0″ 2.1m-Dot Vari-Angle Touchscreen LCD
- Vertical Grip, 2x CFexpress Type B Slots
- Wi-Fi 6E, 2.5G Base-T Wired Ethernet
Speed, precision, and reliability, the Canon EOS R1 is built for photojournalists, sports photographers, wildlife shooters, and other image-makers who can't afford to miss the shot.
The flagship of the EOS R line, this mirrorless camera sports a full-frame 24MP BSI stacked sensor, DIGIC Accelerator processing, next-gen Dual Pixel Intelligent AF, and the robust design expected from a professional workhorse.



This was an issue I had with both R1 cameras shooting video with the RF 24-105 f/2.8L IS USM Z lens before the last firmware update. It specifically happened right around 35mm and I would have to zoom out to 24mm and focus would work just fine - zoom to around 50mm and it would work, too. It does say "subject" in the text, and I wasn't using subject detection. After the last update, I shot 2 video projects and the issue appeared to be resolved - at least for the 24-105. Perhaps it impacted more lenses or they recognized something else that I thankfully haven't encountered. haha But it was the absolute weirdest thing to see...the R1 just would not focus at all unless I changed the focal length on the lens. Taking photos, focus was just fine.
images on the other card they are not at risk. And I low-level format the card I
will use for the update before uploading the update to it. I'm in the process of
doing the 1.03 update right now ... about 80% complete as I type this.
and camera appears to be working "as though I hadn't done an update at all" (again -
as expected).
I am always amazed at how slow updates are - with a camera processor and card
capable of taking pictures at such high rates of speed you would think that the
update progress bar would be 'racing' across the screen. *G*.
- just guessing. My upgrade went fine, first time. I copied upgrade file to the SD (or CF?)
card using Windows and a Lexar card reader/interface ... - Jim in the PNW
Other suggestion: try updating with a lens mounted on the camera.