I purchased my DX200 unit since iBasso came out and I once updated XMOS DFU firmware back the the days. I later discovered recently that there was internal XMOS firmware 1.2 update that can resolve playback glitches but couldn’t find any update online.
It appears you need to contact iBasso for DFU firmware 1.2 for upgrading XMOS chipset. This will resolve playback glitches like pops and clicks between track. To make things easier for older DX200 unit with XMOS firmware 1.0 and 1.1, I’ll host the mirror here with instructions included.