Mpman BT20 - Manual (Page 29)

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(the Interface is as follows)
3. Power on your MP3 player enter into “Settings” and
select “System”, choose “Upgrade” item, you will be asked
“Firmware upgrade?”, choose “Yes”, then connect the
player to PC via USB cable. After 3 seconds, click [Update]
till the Auto Upgrading is achieved.
4. After upgrading is completed, disconnect your MP3 with
computer, re-power on it, you will see “System Init…”, that
means MP3 player start to initialize the system. After it is
completed, you will see MP3 player’s main menu again.
5. Now connect MP3 player with computer again, click this
removable disk, you will see the window that asking you to
format removable disk, click “Yes” and start formatting, after