That command is used to reload an OS on your device if you're having difficulties with the computer detecting the device.
If you weren't having any issues like that, then you shouldn't have used that command.
You most likely wiped the device and when it went to load the OS, it wasn't able to find it on your PC.
Here is the most recent official OS for your device with instructions on how to install it Latest OS: 9530: 18.104.22.168 / 22.214.171.124 From Bell
Also, what issue were you having that prompted you to run that command?
If you don't have a backup of your data, there's a good chance that you lost it all, including that girl's number.