R6400v2 does nothing with dd-wrt upgrade

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mynet6400
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R6400v2 does nothing with dd-wrt upgrade

I've followed all the steps to upgrade our Netgear R6400v2 to dd-wrt but after browsing for the .chk file then clicking on Apply the screen refreshes and nothing happens. The .chk file is the Kong 6/8/19 upgrade only for the v2 variant.

Tried to get the board ID - took out four screws but the chassis will not open.

I have no idea how to flash this R6400v2.