Macbook Pro 11,1 (Sonoma) won't connect to iCloud (and when it does, FaceTime and iMessage don't work

I've heard of this happening but this is the first time it's happened to me so I'd appreciate any input:

got a 13" 2013 MacBook Pro (MBP11,1);
fans were blasting at full speed and it was kinda laggy. Didn't show any serial number or Mac year in the About view but I thought it was a bug
upgraded to highest official OS (Big Sur) and still wasn't seeing serial info. Fans still blasting. Booted into Diagnostics and it said missing serial number;
I used the Boot flashing tool from Mac Repository I think I is to see the serial number to what is on the bottom of the Mac (after confirming that serial number corresponded to the specs);
serial number works yay but still blasting fans;
upgraded to Sonoma via OCLP and checked Disable Firmware Throttling in OpenCore but fans still blast;
logged in to iCloud but iMessage and FaceTime werent working (no errors, just couldn't make/send or receive calls or messages);
tried the SMBIOS spoofing in OCLP using the serial number and the logic board serial number, but then iMessage and FaceTime wouldn't log in;
I tried to generate a random serial number combo but same problem with iMessage and FaceTime but now iCloud won't log in either

iATKOS | United Kingdom