I received the answer from Adtran directly. If the firmware version has an "E" at the end (i.e. 18.02.01.00.E), then it has enhanced feature pack installed. Mine does, so I do.
Thank you for asking this question in the Support Community. Everything you have done is correct. The 4200820E2 part number is the bundled number which includes the software and hardware. The 1202820G1 is the actual hardware part number of the unit. To verify the unit has the Enhanced Feature Pack (EFP) loaded, you will have to login. You can do this via the web interface (GUI) or the command line (CLI).
From the GUI the System Summary page will show the "Firmware Version." If the firmware version ends in "E" then the unit has the EFP loaded. If it does not end in "E," then it is the standard feature pack (SFP).
From the CLI issue the command show version. Then the first line will show the firmware version. If it ends in "E" then the unit has the EFP loaded.
ROUTER-NAME# show version
ADTRAN, Inc. OS version 18.03.01.00.E
I hope that makes sense, but please do not hesitate to reply if you have any additional questions.
I went ahead and flagged this post as “Assumed Answered.” If any of the responses on this thread assisted you, please mark them as either Correct or Helpful answers with the applicable buttons. This will make them visible and help other members of the community find solutions more easily. If you still need assistance, I would be more than happy to continue working with you on this - just let me know in a reply.