After a resort of iPhone X, is it normal for the apple logo to continue appearing & disappearing?

No the device should load to the Hello screen, I’d restore the device again, place into iTunes restore mode and restore via iTunes on a PC or Mac

Genuine Apple Cable? Place the device into iTunes restore mode like the article says, https://support.apple.com/en-au/HT201263 try another USB port also, and try restarting the Mac

Ok that’s usually the cable, do you have another cable to try?

Do you have iTunes 12.8 ?

Yes it does

The Mac you are using needs iTunes 12.8 at least or Mojave installed to see the iPhone https://support.apple.com/en-au/HT201252