These use a Ralink chipset that only has preliminary support and requires a manual build. D1/D2 models are known to have problems with the latest ethernet driver(s) and require the use of an older driver. D3/D4 are relatively stable with an unmodified trunk build. How to enter UBOOT mode: When you press RESET button for Disconnect the power, Then turn on the power, after 10 seconds release the power. Hardware Highlights Revisions: D4 … Continue reading D-Link Dir-615 D4 OPENWRT and DD-WRT Firmware Download