@Fandy1 That is quite an old firmware, is there a specific reason you are looking to do this? You may need to contact TP Link directly as the firmware is no longer available for download.

@Farnley 300m is a fair distance and honestly, the EAP225 would struggle to provide a decent connection at that distance, even with a directional antenna. The transmission power of the AP simply isnt...

@Johnely Personally, I have never used this POE injector, but according to the specifications it would appear to be perfectly fine for use with a EAP225

@Andrew71 Yes you can downgrade directly, you need to do this via the controller interface (log in via IP). However it will affect all sites you have on this controller, so if you have sites that are...

@JoeSea That is a pretty much PERFECT answer, kudos!

@Alexandre. You may find that an Android phone would also do this, some have hot spots that are configurable for different channels