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.