The files that don’t show up were transferred in a different usb mode. When the player is connected, only files transferred in the currently set usb mode will show on the player on your pc. Files not showing means they were transferred in the other usb mode. Boot the player to the original firmware(hold down the left button while turning it on). Go to settings, system settings, usb mode and change the setting. if it is set to MSC then set it to MTP. Connect the player. Delete all the files you see on the player and on the card. Disconnect the player and set the usb mode to MSC then reconnect. Keep the player on MSC mode which is needed for Rockbox. Now you will have only MSC transferred files on the player. Add additional files to the player and the card.
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