I have the GL-X3000 with last stable firmware. I have problems sending SMS and I wanted to try with the beta version of the firmware, but it does not allow me to install it because it does not pass the checks. In the documentation it shows a switch that allows you to enable preview versions, but I do not have that switch.
You are uploading the wrong firmware.
XE3000 isn‘t the right one. Please download the right one here: GL.iNet download center
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