i brought used denon dn 4500 mk2 after using one show i got to know why he sold it ,it stucks while playing or hangs in between .i used only 16 gb flash drive which has 11gb data in it. after doing research i came to know that there is patch or something which troubleshoot this issue can any one give me link to download patch and shortcut keys to check firmware version thanx in advance
If the unit has a firmware update it will be on the product webpage (unless Denon DJ has shitty team that runs the page and didn’t upload it which is highly unlikely).
How to check firmware version is in the manual. That also should be on the product webpage. Back in the day, we used to read the manual when we had issues.
PS problems you described seem like case of corrupted/unsupported media files (unit probably only supports 44.1khz files)
The links for all the legacy Denon stuff can be found at the above website, including setup stuff for some of the equipment.