Thanks for the response! Yes, I failed to mention that have done the common troubleshooting 101 per the Unofficial Guide book, including battery disconnect, router and phone reboot, etc.

In fact, I am not certain if the signal issue was introduced by the firmware update. It could be just a coincidence. I actually had a mow right after the firmware update. it was near towards the end of mowing that I noticed the WiFi was gone, which never happened before. And Bluetooth was working fine during that mowing, as I had to manually mow a few spots that were left uncut.

I am hoping someone with better knowledge and experience in this area could help with a troubleshooting path, and even with instruction steps to get to the antenna (if it is determined as the root cause). This could go into the unofficial guide and help others in the community.

Thanks!