The 1.28 firmwhare with the 4,000 file limit

If your Clip Sport already has a Firmware newer than 1.28, you may not be able to install; according to user clipfan7.

I have not tested this problem myself.  All my Clip Sports are running FW 1.28 and I do not plan to update.

FW 1.28 includes the ability to lock the player by pressing the “Back” button for about 3 secs. Unlock is the same.

Album Tracks can be played two ways: Music Mode and Folder Mode.

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