The other day I did a a fresh install of Astroberry. I set up all my devices like I normally would do. Bresser Mount w/ Eqmod controller, Canon 20d, ASI120MC guide cam. Once that was done started the indi web server and connected a remote pc with Kstars. Everything was working well until I started to do the polar alignment tool. Kstars would crash and shutdown. I found that a setting in the Indi profile for the canon was set the large JPEG file format. Once I change this to RAW format everything work well. I never had to change this before but looks like this is change every time I make a connection to the camera. I have tried to save the setting to raw on the camera but it will change back to JPEG once the Indi makes it's connection. If there is something I can do to change this or is this the new procedure when I connect to the camera.
I see you have an EqStar Pro, I just got mine the other day and the only way I have been able to connect to is using the Snyscan app on IOS. I am having no luck getting the astroberry to connect to the serial port.
For you issue I had the same problem with the bressor exos2 goto system. I found a custom driver that worked but the sewing was all wrong.
Well at least you are getting connected I cannot even get the EqStar Pro serial port to work on my astroberry thinking about getting the stellarmate. How well does those the EQstar Pro work with stellarmate.
I have had the same issue here are some links to them.