So, despite of:
- spending almost one hour reading the lengthy lab instructions and fixing the silly putty defaults on all devices
- getting continuous error (os-related) messages filling my console on all IOS-XR boxes during my whole exam
- having an unhelpful proctor giving unclear answers to two questions of mine
- not verifying anything at the end due to time pressure
...i managed to PASS!!!
I will post more details in the next few days, after i recover from today's shock.
PS: For anyone wondering what was the first thing i did after i saw the results (besides screaming and jumping up and down), it was to submit my comments under the "Lab Critique" field.