I have found this List of firmwares, flashtools and management-tools: . I was able to remove the password with the Firmware Upgrade Tool Duplex 2.36 and the correct firmware. One can just follow the flash manual. The important thing is too choose "Flash Firmware and remove User Data" in the flashtool.
Make sure you have the correct "Doc_and_Tool" as well, because you can only reconfigure your device with the Manage Tool in that package.
Have fun!
Now you need a UART to USB (or M) datacabel for Queclink that is not included in every delivery of the Queclink GL300.
Than you can flash the firmware with the Firmware_Upgrade_Tool_Duplex and delete user data.
Afterwards you can reconfigure the Device with the management tool.
Queclink Gv300 Manage Tool Download
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