3) If the device goes to factory mode which cannot detect the firmware,
the reason may be that the firmware file is damaged. At this time, press
the power button to reboot the device. Re-download the firmware file
and restart the upgrade.
4. How to install third-party apps?
There are two ways that are similar to mobile phones' to install
applications.
1) Method 1: After connecting the device to a valid WiFi, go to FiiO
market, Google Play or other app markets to download and install the
app directly.
2) Method 2 (Local installation): copy the APK file to the JM21. Go to
the file management menu to find the file and install it.
5. How to change the language?
Go to Settings->System->Languages and input->Languages->Add a
language to choose the intended language. Press the "=" icon on the
right side and drag it to the first line to select the language successfully.
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