First off, the obvious: Make sure you are in bootloader mode.
2nd: boot.img must be in the same folder as the fastboot.exe file.
Once in bootloader mode, run this command to see if your device is being recognized correctly:
If you get a response back with a string of numbers/letters, you should be good. If no devices present, make sure you go to your Device Manager and see if there are any errors for the driver.
Once you have no issues with the driver and the PC recognizes it in fastboot, then make sure you have the correct boot.img and try again. Also, for the recovery, it should be this command:
fastboot flash recovery recovery.img (or whatever you have named the .img file)
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