S3 2022 - Error 45

Hi all,
Since the past 3 to 4 months I've started encountering the error 45, sometimes the error 48 issue on my S3 from 2022.

The bike does not seem to have any power delivered to the acceleration or to the boost systems.
The E-shifter seems busted as well since I'm stuck in first gear, with no method to get out of 1st.

The lights, bell and connecting to the app does work and charging the bike goes without issues.

I've had the bike been sent to one of the 'local' repair shops but they weren't able to provide me with any help ( apart from a 100 euro fix for my gear shifter, which failed after about 3 weeks again ).

Do you guys have any ideas on how to resolve this?
I did find an old post from 5 years ago but that didn't do anything too much.
I'm not too tech savy in regards to bike repairs.