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I've recently bought ZTE MF820D USB GSM modem especially for the LTE feature, although that's the only mode I'm having problem with. EDGE and UMTS are working fine, but after a while the mode is changed to LTE and download stops completely, while uploading continues. When I establish a new LTE connection, every time I see 62 bits sent and no more, and again upload rising.

There was a one (ONE!) LTE connection that worked, and that was exactly after system update and reboot. Never before or later...

How can I debug that? Any useful tips for system logs?

Again, Modem Manager GUI and system bar networks are saying that the connection is negotiated.

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Needed to do a firmware update of the ZTE MF820D GSM modem under Windows, found HERE.

Previous version: B14
New version: B33

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