Upnp problem

[AdamN]

If you use DMZ you don't need any other port-forwarding feature (like UPnP for example). DMZ will open all the ports and forward it to your IP, so you can disable UPnP on PPSSPP settings.

Regarding static IP, if you don't know how to set it from router settings, you can set manual IP on your iPhone's wifi setting.
You can use the automatic (DHCP) to find out a valid IP first, and then change it to manual IP and set the same IP with the automatic one.

Anyway, i will try to add an option to change the UPnP Timeout for you to test later, hopefully it's just timeout-not-long-enough issue.