OpenWRT and Huawei E3372s

People should stop using these ancient modems :wink:
Let me summarise some recommendations:

  • install the latest modem firmware (21.300.05.*)
  • set ff;10,12,16 USB composition
  • make minimal NCM config, refer to the official instructions if necessary
  • boot the router without modem attached
  • connect the modem using a short extension cable (if available)
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