If there are some problems happened to the device, perform the factory data
reset would help (In the menu of Settings->System->Reset options).
Notes: The "Factory data reset" will erase all data from the internal storage and
reset the device to defaults. Please backup corresponding files in advance.
4.Technical support
1) On the homepage, tap Technical Support to enter the menu. Here are several
commonly-used functions and our contacts.
2) Firmware update: online and local upgrade are available.
FAQ (frequently asked questions): parts of frequently asked questions and
corresponding measures are listed.
3) Quick start guide: tap to check out the internal quick start guide of the M21.
4) Contact us: here shows our email address, Facebook, Twitter, etc.
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