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Indeed you need to call. In most cases it's extremely easy and usually the first person you get live on the phone can do it on the spot. Call 1-888-4-ADTRAN which is 1-888-423-8726. Not 1-800-4-ADTRAN. That's something completely different.
Thank you so much. I called and indeed a friendly person was able to
help me with the CHALLENGE response and I now have access to the
Managed to get the PW reset but something else is wrong.
I am not able to edit any of the other parameters.
The firmware revision is D.00.55.
Bootcode rev: A.08
Thanks JayH! You did have the correct answer and I re-marked it as such.
After getting a new challenge code, 6-7 times... It does allow access but not the ability to edit anything.
I resorted to cycling power while pressing the F key (Putty and Craft Port) until it shows "Factory Reset?" then enter YES.
Was able to update firmware to the 04 level but not the 05. Seems any firmware larger than a certain size will not load.