Firmware Reset For Zte K3772-z 5
Giulia Satmary
If you would like to make your K3772 modem work with a TP-Link router using the simplest means possible, just grab the following file, unpack it and upload it to the router under the 3G modem settings page:
For those not in the know, the reason for all the mucking about is because many of these modems present themselves as virtual CD-ROM drives when connected so that they can automatically install drivers. Once the driver is installed it sends a command to the modem to switch it into modem mode.
Usb_modeswitch is a popular Linux tool created for this exact purpose, and unpacking the MR3020 firmware image with firmware_mod_kit reveals that it uses this very tool to set up modems that are connected. The bin file above simply seems to be some obfuscated instructions for usb_modeswtich.
I have the TL-MR3420. I had no success with the bin file at first but then I downloaded and installed the latest firmware upgrade ( -link.com/en/support/download/?model=TL%2DMR3420) and then tried again with the bin file. It took about 8 minutes to identify my network (Vodafone GH) but then it worked. It took a few reboots and resets on the router but it finally worked.