Has there been any further development on that issue?

I also own a modded Canon M100 and I am unable to take exposures longer than 320sec - with the same error as above.
The camera can definitely go longer - for example when using Cascable, which is a 3rd party smartphone remote control app, I can go any exposure length - like 6 or 10 minutes, without any issues.

This is really a deal breaker for me :/ - it is an excellent small camera with great sensor and it is a pity to not be able to use it as intended with INDI.

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