@Minew : There should be no need to reset the box. Once Crave is authorized, you should be able to use it on any digital box in the home at any time, as well as with the Crave app on devices like tablets and cell phones, or on a computer with the correct link to Crave in your browser. You will need to login using the appropriate credentials for these devices, but that's not necessary for digital boxes.
What was the make/model of the box you had? What is the make/model of the box you now have? What is the make/model of the box they plan to send you? I assume you are renting these boxes? Rogers will need to properly activate and authorize your box for the channels that you subscribe to when you get it. If you simply plugged in your box expecting it to work, it may not, since it may not be properly activated/authorized. Call Rogers with the serial number of the box and have them properly authorize it.
I'm assuming you're on legacy digital cable and not on the new IgniteTV (IPTV) service, since you have posted in the "TV" section of this forum.
I'm assuming you purchased Crave through Rogers and not directly from Crave.