I was searching through the forum but I stumbled upon an article saying that as a CEC inland, I will have to have my PR card to update my SIN and COPR will not be enough to process.
I dont think, this is tru, from my personal experience.
You need your COPR, address proof and your passport. Thats all I had to show them. In fact, they have the details updated in their system, while they input your details.
I only brought my COPR, passport and BC ID when I updated my SIN the next day after landing. I was inland spousal sponsorship so I had to wait about 7 weeks after landing to get the PR card.