Keep in mind IF you have CFE converted it to an E3000, you will need the E3000 stock firmwares.
Fwiw on my converted units I put a small "post it" on the bottom as a future reminder it is an E3000 now.
This post is based on user commentary observations from here:
http://dd-wrt.com/forum/viewtopic.php?p=953117#953117 _________________ reenignE esreveR
Resistance is NOT futile... It's Voltage divided by Current!
_.-:Curently Deployed Devices:-._
Loc_1.0: R6400 -- Kong PTB 35550M 03-28-2018
Loc_2.0: R6300v2 -- Kong PTB 35550M 03-28-2018
Loc_3.0: R6300v2 -- Kong PTB 35030M 02-19-2018
Loc_4.0: R6300v2 -- Kong PTB 28600M 12-31-2015 (Radios OFF) & 5 Ubiquity UniFi APs
Loc_4.1: E4200 -- BrainSlayer K2.6 30880
Others: too many others to list