Cannot connect Razer Core X to ASUS Zenbook UX325JA  

@nikita_ar4ikov, Have you tried cold-boot with the eGPU connected? Look into the BIOS settings and see if you can change Thunderbolt Security settings (to No Security).

@itsage, I've tried it. In my BIOS settings there's one option in Thunderbolt Controller settings: No Security. And when I try to cold-boot with my eGPU-connected, notebook doesn't start (only power-on black screen without any logos & etc.). Whenever I try power-on my notebook with eGPU, it starts normally but have the same problem as described in topic. And when I try to reboot notebook, notebook doesn't start.

@nikita_ar4ikov, Remove the RTX 2060S from the Razer Core X then try again. I know some GPUs cause boot-hang and that might be the culprit to your connection issue.

@itsage, I've removed 2060S. Notebook starts successfully but same problem, autodisconnect and looped.

@nikita_ar4ikov, That's too bad. You may have to look into updating the BIOS/firmware for the laptop.

@itsage, I've tried to install many other different BIOS versions: nothing. Btw, sometimes there is a success connection, and when I disconnect and reconnect the cable - same troubleshooting.

I've installed Ubuntu 20.04 LTS and the same problem. It probably means that the problem not in OS-level, pick down to BIOS-level or Hardware-level

Hello there, guys!

I've FINALLY solved it! 
So, as I know, ASUS or new Intel Tiger Ridge Chips needs to use Tb3 cables from LIST OF VENDORS (mb its dumb theory, but I have no reason to think different)

As fact, after 1.5 month of brainduckinguseless actions and 2 requests to tech support service, I'd randomly decided to buy an Apple Tb3 Type-c 0.8m cable in my local store. And, finally, after cancelled response from tech support, I tried to plug in Apple cable. 

FAQ:
Q: Maybe you have some old troubled Razer Core cable?
A: Probably. There's a chance that my Razer Core cable have some issues with lines in it or with input part. at this moment I cannot trust it and check it. 

Q: Have you tested other Tb3 Docks or Hubs with both cables yet? 
A: Not yet.

@nikita_ar4ikov, This is great news, and good info for the forum for future users. Kudos!