Hello Randy, @ericwong has put together a guide on checking your hardware revision here
From the status page, you are looking for the Revision #
You may still be able to access the older Firmware versions through InControl2 with the Firmware Management options.
If you wish to do it via a direct URL, then the old binaries can be found here in the Downloads Archive at https://www.peplink.com/support/downloads/archive
