Precision m6700 with FirePro M6000 ubuntu 18.04 drivers

Hello,

I am running ubuntu 18.04 LTS with latest updates but recently I experienced GUI hangs. I started searching for Dell dedicated driver and found this one Radeon Pro Software for Enterprise 20.Q1.1 for Linux

Now the problem is that it no longer hangs randomly but hangs always within about 1 minute since login to desktop. I would like to remove this bad quality driver via emergency boot but there's no amdgpu-pro-uninstall script as described in the documentation.

Question 1:

Where can I find the uninstall script?

Question 2:

Is there still any working driver for AMD FirePro M6000? For a long time I was running only "compatible" generic driver.

Many thanks in advance!