Luoran M4, Instructions Manual, Page: 7 / 15

If it can, it means that the previous cable has
been damaged. You can also use the USB cable
to try to charge other devices, such as
cellphones, to check whether it can charge
other devices. If not, it means also that the
cable has been damaged.
If it is confirmed that both the USB cable and
the charging port are normal, it can be
determined that it is the fault of the player
itself. Please contact after-sales support for
replacement or refund.
█ Nothing happens when the player is
connected to the computer with a USB cable.
Usually, use a USB cable to connect the player
to the computer, the top of the player will
appear with 2 icons:
and . And an MTP
device named M4 will appear in the drive list
of your computer.
Troubleshooting:
▸
Check whether it is caused by poor contact.
In most cases, such failure is caused by poor
contact. You can repeatedly plug and unplug
the USB cable to test whether the connection
can be resumed.
▸
Check whether the USB port is damaged.
Connect the player to a computer with an