Does the car run fine but you get the warnings on? If it works, drive it smoothly without stops and starts, and the DPF will clean up.
For the DPF reset using the wire approach, the wire does not ground everywhere. I "plug" it between the top mount and the chassis to make it work. Just touching the chassis metal is not enough. I do not know why.
The first time I went to an independent garage he had one of these snap on readers. He could not reset the DPF but it reset with the wire.
DPF flashing normally means that you are fine but need a service. The works with no problems.
The car is set up to work with the MAF sensor, the EGR and the DPF. If they have played around them and the ECU, there will be a lot of errors.
Because there are plenty of sensors involved in the process, try to find out whether your ECU is a stock one and gives the rights signals. I suppose the dealer or somebody with knowledge can advise you on that.
If you are fine from an electrics/electronic point of view, then you can do the forced DPF regeneration, injection callibration, service reset, etc.