TDI timing

Hi.

I'm driving a late 1999 Audi A4 TDI V6.
Recently i checked the timing, and it was completely off (too advanced).
The car doesn't have the power it should have in the lower rpms. And the turbo boost comes at about 2400 rpm instead of 1700.

Now, a mechanic told me, that it's able to adjust the timing via software, so it's not necessary to adjust it by turning the VE pump. Is that correct ?
If so, how do I do that ?

Thanks in advance guys.

The initial adjustment has to be performed by mechanically turning the VEP. Once that is done, the ECM will adjust the timing based on it's parameters/input signals. The ECM can NOT overcome an mechanically incorrectly adjusted VEP.

thanks for that ;-)