Depending on the UC Software Version, pressing the key combinations from the beginning will not work. Here is what you have to do: After powering the phone, when you see the "Loading Application" press Cancel which will cancel the loading process. Soon after you will see a Countdown (5 sec Until Boot) - this is when you press the Key combination and you will be prompted to "Enter the Reset Password" which is the MAC Address (do it fast before the countdown ends in order to get the reset pass prompt).
To give you more info, if you press the key combination and the phone loads the application and shows Info/Mac and then shows the lines registered or extension number, then it will not work.
Depending on the UC Software Version, pressing the key combinations from the beginning will not work. Here is what you have to do: After powering the phone, when you see the "Loading Application" press Cancel which will cancel the loading process. Soon after you will see a Countdown (5 sec Until Boot) - this is when you press the Key combination and you will be prompted to "Enter the Reset Password" which is the MAC Address (do it fast before the countdown ends in order to get the reset pass prompt).
To give you more info, if you press the key combination and the phone loads the application and shows Info/Mac and then shows the lines registered or extension number, then it will not work.