Hello Aster,
Based on the most recent posts from Manic01 and Barney115 could you try the following steps please...
1. Unplug or switch your M3 receiver off and on again.
2. Remove the usb stick, then re-insert again.
3. Go to any channel with a signal and record for a minute or two. Doesn't matter what the program is...
4. Then go to Main menu, USB Menu, then your list of files via File Manager.
I am hoping that following these steps will result in you seeing your most recent test (2min) recording
appearing at the top the list of recordings and thus your files again sorted by date most recent working
again.
I hope this does help.