Hello @stylishhumdrum ,
Thank you for your patience as we looked into this.
We have not had any other reports of firmware 9.08.57E 0017 not being able to connect to a wifi network and going back to the Ad-hoc settings like you are experiencing.
We do not have firmware version 9.08.50E 0012 available that is on the unit connecting to your network unfortunately, the earliest that we have available is 9.08.57E 0015. I have attached a zip file with this version that you can try.
We recommend running the latest version of the firmware for PM1115UW as it includes bugfixes and improvements. However, it can be beneficial to run older firmware versions such as this one for the purposes of troubleshooting or for deployments with specific needs.
Lukas T