VW Golf 7 2015 2.0 TFSi Start Issue & Power Loss

Hi guys,
I'm a newbie in the automotive diagnostics.

Here are the details of the car:
Golf 7 R 2.0 TFSI 2015. Odometer: 29.000 Km.
VIN: WVWZZZAUZFW020362
Engine ECU: CJXC / 5G0906259E

The problems:
- One DTC as shown in the image below.
- Long cranking before start.
- Loss in power and sudden speed drops.

I can see in the measures values the high pressure value is only 8.8 bars instead of 50 but would it be something other than the high pressure pump. I suspect an other guy here in the workshop has touched something in the engine adaptation values because the car didn't suffer anything related to the engine when the owner brought it to the workshop.

I have done every possible adaptation using the guided function of ODIS and I've seen some adaptation values have been changed then but the problems didn't change at all what ever I change in those adaptation values.

The measurements values in the image below were taken while the engine is running idle. I'm using ODIS 4.0.0.

Please help me pinpoint the culprit of this mess.

DTC.PNG
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