I'm having trouble upgrading the AC68U firmware from 378.55 (current build is Fri Jul 17 03:17:04 UTC 2015 merlin@05199da) to 378.56_2 on my TM-AC1900. The web interface throws an error when attempting to upload the file. Bootloader version is 2.1.2.5. Any idea what I should try to do?
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