"No Tethering device found" on MT1300

I found a solution. Searching for the device id of my phone (05c6:9024, from lsusb) led me to an OpenWRT discussion: UF896 - Qualcomm MSM8916 LTE router ~384MiB RAM/2.4GiB flash, Android: OpenWrt? - For Developers - OpenWrt Forum

The solution is to edit /etc/usb-mode.json and remove these lines:

                "05c6:9024": {
                        "*": {
                                "t_vendor": 1478,
                                "t_product": [ 36901 ],
                                "mode": "StandardEject",
                                "msg": [  ]
                        }
                },

After that I plugged my device again and I can tether without any issues.

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