Hi,
can you elaborate on what behaviour you encounter? we had to downgrade our 2 UR10 CB3 to 3.11. I see now that i already commented on your post regarding the same issue here C4A1: Communication with controller lost on CB3.0 robot
We have had no news from UR regarding that issue and are still stuck on 3.11 since then, are you in touch with UR to track down that issue? we raised the issue with our local distributor and here on the forum but it seems the issue has been lost, even with multiple users complaining about it.
If anybody at UR can check the internal status of that we would be very grateful as we have currently forbid our UR10s of being used for certain critical applications because of that.
Thibault