Solution
The hardware revision will be included in the device's part number.
- Find the part number of your hardware. It will likely be on a sticker on the side of the unit.
- Look at the structure of the serial number. It should have a similar form to the following: XXXXXXY-XXZ, where Xs are numbers, Y is a letter, and Z is a letter.
- Isolate the the letter in the "Y" spot is the hardware's revision.
- For example, part number 157420C-01L is revision C.