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Adtran 904 2nd Gen cannot upgrade beyond

Old Adtran 904 2ndGen had firmware, which I was able to upgrade to  I am not able to upgrade to anything higher that is available, so I tried using, which failed (see below).  How can I get this unit upgraded?  Eventually want to upgrade to the latest, R13.5.2

Verifying images. Please wait...

Unknown header version, ignoring...

Bad file signature.

'' is not a valid image.

Primary image error.  Primary boot configuration not updated!!!

Reverting to primary image ""

Primary image:

Backup image:

The boot ROM that is on this unit is the same as on other 9XX units that we have and they have newer firmware on them.

Hardware version A

Boot ROM version 14.04.00

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Honored Contributor
Honored Contributor

Re: Adtran 904 2nd Gen cannot upgrade beyond

The file you're trying to load has a bad checksum or hash value. It's also really old. Download and try that.