[linkin360]

Here's my fix, it has worked for a few days and is basically cleaning the wheel contacts. I post it here since from the beginning, head-fi users have reported wheel issues, some minor fixes have been recommended but for some of us none would work.
Tools needed: prying tool or flat screwdriver, high grit sandpaper or similar material to clean metal contacts.

1. Before messing with your X1, try the last stable firmware (2.0) as it includes software fixes for the wheel sensitivity. (check release thread).
   
2. Disassemble the wheel.
   
   1. Get your X1, I'll demonstrate on mine. Lightly press the center button and rotate it counter-clockwise to remove the top of the button. There is a video on youtube that shows this, and the whole disassembly of the X1, but not the wheel mechanism (link).
      
      
      
      
   2. Put aside the button cover, with the button exposed remove the wheel prying between the wheel and the black disc:
      
      
      
      
   3. With the wheel removed, separate the wheel mechanism.
      
      
      
      
   4. Pry out the metal piece, being careful to not bend it.
      
      
   5. That metal piece holds in place the black plastic ring with the metal contacts, after removing it you can simply lift the plastic ring
      
      
      
      
   6. Clean the contacts on the bottom of the ring, try to restore some shine to the metal
      
      
      
      
   7. Also clean the contacts under the ring assembly
      
      
      
      
   8. Make sure there is no dust or debris and reassemble in opposite order.

I've done this with two players in the last 10 days and the wheel has worked like new in one player and on the other it only feels a little stiff when passing the finger on the lower right side. Hope it helps other fiio X1 owners who are not ready to trow it away.

 

[vyogan]

How do you even remove the center button? Mine won't even rotate!

What a miracle! I just tried to turn it on to see if the button still works, then I find out that the wheel is fixed!!! I didn't even open it!! Must be due to the pressure applied on the wheel while I was trying to undo the center button.

 

[linkin360]

In the YouTube video they show that step with more detail, it seems to need a little force and it rotates counterclockwise. Hope yours keep working.