Hello, can someone help me check this serial/number: 1WGSH8A5T20VSK
if it's legit or has any problems ? thanks!

This is a user forum.  The only ones who can help with this request is DJI.  Maybe one of the DJI people who are here will see this and will be able to answer, otherwise contact DJI support.

Below is what I got from the Dji Decoder:

Model: Unknown, build on: 10. August 2020

Hello there cosmin092. Good day and thank you for the inquiry. I have sent you a PM with regards to this matter. Kindly please check it if you have time. Thank you.

Suren Posted at 5-5 11:30
Below is what I got from the Dji Decoder:

Model: Unknown, build on: 10. August 2020

what does it mean when it says model unknown? is it because the drone is yet to be activated?

pedromrs20 Posted at 5-6 01:03
what does it mean when it says model unknown? is it because the drone is yet to be activated?

My understanding is that the online decoder does not know about the newer models, so it can't determine what it is.  My Mini also lists as Unknown.

pedromrs20 Posted at 5-6 01:03
what does it mean when it says model unknown? is it because the drone is yet to be activated?

As K6CCC mentioned below is because it is a new model drone. this decoder was developed around the time for the original Mavic pro.