To ensure the security of your network, Plume currently only supports WPA2-PSK AES, since older security standards are easily compromised with little effort. As a result, older devices like the Sony PSP that only support older Wi-Fi security standards such as: WEP, WPA or WPS, will not be able to connect to Plume.
If you absolutely need to connect an older device to Plume, you can connect an older wireless router as an access point that is broadcasting a different SSID that can be used specifically for the older device.
Because you are going to use an inherently weaker security standard for this SSID, it should always be turned off when not in use.
If the device in question also has an Ethernet port, connect it to a pod by Ethernet instead.