Changing cable is not going to improve anything as it is sending synchronous high speed digital data to properly terminated interface with controlled impedance path.
My general advise is don’t fall into hype of improving digital audio path often advertized in different social media. I am EE with master of science degree, designing these circuits for over 25yrs for a living with multiple products in the market in US and around the world and I can assure you there is no room for homebrew improvement for this kind of product, it can only lead to worsening its performance or breakdown
Again, this is not an analog product, don’t mess with it. Goodluck.
P.S. word of note... about firmware upgrade Novatron was emailing users about. I confirm their latest revision R.1688 has two major bugs, one is where UPnP server stops working after upgrade, second the database root file may get corrupted showing incorrect Album information under Artist in main Album browsing view.
Also, trying to downgrade back to factory R.1530 will cause the player to be blind to music database, without ability to initialize or rescan it, as these two options will disappear from the Setup menu after downgrade from R.1688 to R.1530.
So my advise, don’t try new 1688 firnware. It may deadlock your X50D player.