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 JM21.
4) Contact us: here shows our email address, Facebook, Twitter, etc.
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