It is a Subaru Forester 2.0 Diesel (SHJ) 2009. The customer got the vxdiag subaru diagnostic box on this car. The cheap ssm cable works till 2009. This time he decided to take a chance and ordered a diagnostic box from VXDIAG Subaru V2022.01, Wi-Fi, for SUBARU SSM-III, 4. It works with Subaru Select Monitor 3.4 (SSM3, SSM4). This is the software that Subaru Dealer uses. You can read errors, flash, and most importantly, regen the DPF filter (relevant for those who have diesel versions).
And now for the mistakes. Errors on the CAN bus. Apparently, there is a problem which need to figure out later.
Now, the most important part. DPF regeneration!
The car flew like a rocket.