how to link turbosound ip 2000 version 1 and ip2000 version 2

two years ago i bought a turbosound ip2000 speaker. then recently i heard that i could link turbosound speakers with each other. so i bought anoher turbosound ip2000 speaker. i had no idea there were two versions. the first one i boght was ip2000 version 1 then the 2nd one was version 2. my problem is i was trying to link the both of them but it wouldnt work. is it because these two have different versions? if so, how do i upgrde my ip2000 vrsion 1? your response would be a big help, stay safe and thank you!