I don't see 160405 for TL-PA9025P, but I see one for TL-PA9020P: http://www.tp-link.fr/download/TL-PA9020P-KIT_V1.html#Firmware Are you sure the model number is TL-PA9025P or the current firmware is...

Home light is a mark of the connection status of the two powerline sockets. When it is read, it means the connection status is not good and the link speed of them is slow, but they are still...

Unplug the receiver and replug it. Try one more time. Using the way below to add a device or change the network name of the two devices. http://www.tp-link.com/en/faq-1615.html...

Your TL-PA9020 is UK version. Upgrade to the last UK firmware.

AV500 can work with AV600. However the link speed between AV500 and AV600 is decided by the slower one. Using AV600 as the main one connected to the router is better.

Good idea. You can feedback to TP-Link support.