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I have an AC1200 Ver 1.1 with the originally shipped firmware

I'm trying to upgrade it to the latest firmware version. I get the message below.

Upgrade unsuccessfully because the version of the upgraded file was incorrect. Please check the filename.

The filename of the bin file entered into the browse selection is, C1200v1_us-up-1.1.0 Build 20170413 rel.56876.bin

That is the filename after the unzip. Do I need to rename it to something simpler like xxxxx.bin?

Much appreciate your help, thanks
Bob