Originally Posted by nty123
Do I just rename the file .zip?
What OS are you on?
The fastboot command is as follows and I usually just rename the image to recovery.img so that's what I wrote below but you can name it whatever you want.
fastboot flash recovery recovery.img
Also you need to be in the same directory in cmd prompt. So if the file is in c:\platform-tools then in cmd prompt you should see.
If not type
Or whatever directory you need to reach.
To make sure the file is there type dir and you will get a list of files within the directory you are in.
Other than that you may need to sort out your fastboot drivers especially if using Windows 8