Downloads and Firmware Link
Good Information >> https://www.3cx.com/sip-phones/yealink-dect-w52p/ (With tool for manual flashing of handset)
username/pwd = admin/admin
Go to Phone >> Enable DHCP Time Zone. I couldn't set it to America anywhere, but DHCP Time fixed the time, good enough for me.
Now go to Account >>
Fill in Line extension PWD and Server Host (FreePBX IP). Enable and confirm and watch it register. This phone was a breeze to set up!
Note FreePBX will only use UDP or TCP, so if you try TCP and it fails, try UDP.