Problem on samsung galaxy watch 4 SM-R870

[Qr10us]

Hi everyone.
I have a Galaxy watch 4 SM-R870 which wasn't working anymore and I had to change the mobo (bought it online from a part supplier).
Now the watch turns on but there's no firmware or at least it's not working as it should (can't upload videos here so I hope pictures are enough).
How can I fix it?
Thank you.

[Oxford]

I don't know what it cost you for the motherboard, but between the cost of the motherboard and the time and energy you put forth trying to solve this, you probably would have been better off picking up a $79 refurbished Galaxy Watch 4 from Amazon. Good luck in finding someone that knows how to correct your problem.

[PapaPo]

I totally agree. I haven't had any trouble with my watch 4 at Amazon.

[J_Noguera05]

I wish I knew how because I currently have the same watch

[Qr10us]

I solved the problem, found both the firmware and the way to flash it.