hc05 bluetooth probleme

i can't set my hc05 bluetooth on the master mode , when i send "AT" using the monitor serie , it doesn't response

i did evrything just like this video and still have the same probleme
pss: i have two hc05 , i set one of them on the slave mode and i taked it's adresse , so it work without problems . But the second one , when i try to set it on the master role it doesn't work just like i told you

Did you have the "key" input high before you powered the module?