I have the AX3200 configured as a range extender.  If I understand correctly, the fw update has to be done manually  since it can't communicate with the TPlink servers. My question is after the update is completed, does the router keep the range extender configuration or will I need to reconfigure it or backing up the configuration an restoring will work?

I remember having a lot a trouble setting it up as an extender and I am not sure what i did to make it work. I am afraid to change anything that makes the router lose the range extender configuration. 

My fw version is 1.0 and the latest is v1.6

thanks