There is a Beta Release which indicates the following:
You can try going to your Wyze App, Select Account, then About, then Beta Program.
Choose Edit in the top right and select Wyze Mesh Router Pro and click save.
Once you do this, you shoul dbe able to get the Beta FW for the router and see if it corrects your issue.
Realizing you may not be able to get out on the WAN to get the FW, you could plug in your old Router, connect the devices through that and then do the update. Basically setup another Network to get the update. Just a thought.