The mod of course void the warranty, but since I've broke the warranty sticker inside earlier...... Don't try this if you can't stand the warranty void.
I'm uncomfortable about the grounding pin, so I just move it to the other side.
(Sorry for my ugly and lazy drawings!)
The pin has a foot and a retractable head.
It's actually too short to contact the cover, so I move it up and off-center, because the hole on back cover is not aligned with the hole on the circuit board.
The pin now sticks out from the hole, which I think is the way it's designed to work.
(The tape is there for easy battery removal.)
I also happens to find that there are excessive solder slug between the silver capacitor pins.
Guess I'm lucky that they did not short out.
The PO plug is loose too, so I also take the chance to pry the contacts a little bit with sharp tweezers.
I can understand that iBasso may have pressure in production, but after opening the case, I think they still have some space for improvement on quality.
And... did the pin stick out in later batches? Mine is 3rd batch...
(Edit: I do think the bass increases after the mod)
This is a concern I had since the first time a removed the back cover to see he battery. In my case the pin stick out to much that the cover was hard to put back.
My DX50 is a later batch (6 or 7). I have to say that I never had any problem with my device and always thought that the grounding pin may be the issue with weird freezing problem reported by others.