I'm looking for new firmware also, my rev is Hardware Version : Bx Firmware Version : 2.02
Try with latest after a check in router, that told me I got the latest.
BUT my wireless is one day I can connect and another day its not able to connect.
I tryed to use DIR-600_fw_revB_2-16b05_all_en_20130610, but been told after a try its not a compatible f/w
I'm located in sweden and ISP from local fibre company
Any hints on this one?