RV to PR conversion isn't automatic. PR is just something you can apply for once you meet the criteria after holding RV for 2 years. Your friend will have to complete the formal PR application and provide evidence of how they meet one of the five criteria, hand over passport and the fee.
Being fired from your job etc has no bearing whatsoever on a future PR application as skilled work does not form any one of the five criteria to show your commitment to remaining in NZ.