Flashing R5 back to 1.1.1 - advice and help please.

Ramage

EOS R5
CR Pro
Aug 27, 2019
484
965
so is it possible to downgrade the R5 to previous firmware version?
I have R5 with RF 100-500mm and EF 500mm USM IS V1, last firmware was installed when i got the camera.
i have focussing issue with both lens ( the EF 500mm works fine adapted to my A7R3) , but 50% if the time , R5 won't focus on "obvious" subject, still or not, exposure is correct, but impossible to focus.
i reinstall the last firmware, nothing change, i would like to know if it's possible to install previous to check?
If i do a factory reset of the R5 which firmare will be automatly installed after reset?
Thanks for helping.
No it is not possible to revert to the previous firmware with consumer based tools.

Keep in mind the EF 500mm V1 is not fully supported on the R5 for highspeed shooting and this may also be impacting the speed and accuracy of focus. Have a look at page 897 and 898 of the advanced user guide to see the list of supported EF glass.

As for the RF 100-500 there are a number of threads with users having issues, might want to have a look at those and join in the discussion by providing some examples with EXIF data intact.

Cheers
 

rico.29

I'm New Here
Feb 27, 2021
15
1
No it is not possible to revert to the previous firmware with consumer based tools.

Keep in mind the EF 500mm V1 is not fully supported on the R5 for highspeed shooting and this may also be impacting the speed and accuracy of focus. Have a look at page 897 and 898 of the advanced user guide to see the list of supported EF glass.

As for the RF 100-500 there are a number of threads with users having issues, might want to have a look at those and join in the discussion by providing some examples with EXIF data intact.

Cheers
thanks ;) , would be really surprising that Canon EF 500mm f4 IS V1 is supported (pretty well with AF) on Sony A7R3 with MC11 , but not on R5? for the moment i don't use hightspeed shooting, i try to fix my AF issue first.
 
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