@David-TP firmware version is V5 just like the article you linked, can't give you exact screenshots or anything atm because I am not at home but I just know that it is v5 because i checked that before

On a quick note the second i pull out the extender from the wall my Pc and modem wifi connection everything works flawlessly

Like I said in the header that when my extender is working my PC says unidentified network and doesnt connect to internet through ethernet also my other wifi connection the one from the modem doesnt...