Mine is a rev C so the crossflash should work.

After reading that thread on broadband, I don't see the need to try flashing to 624 firmware. The items complained about work fine for me, DHCP, time, no rebooting....

I currently have the 524 firmware v 3.02. I did try fixing something that wasn't broke by loading 3.20. Didn't work well at all.
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Glenn