Proscend M302-L - Page 135

INDUSTRIAL 4G LTE CELLULAR ROUTER – B_UM V1.1.0
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The link will redirect to Files tab
Press File: browse button, select the firmware, and then press Upload button.
The firmware will be added to listing files as below.
7.2) Upgrade
Move mouse to the Push file>> link, the upgrade firmware name will pop up as below picture.