Well, I want to add that the new Uboot is way better than the NAND only version shipped with my AR300M. No MTU issues - uploading the firmware is now flawless on Windows. This is the way it should have been on release. If any current AR300M user has this old Uboot, I would highly suggest not testing unknown images on your device without upgrading Uboot to this version.

I did not even solder the board. I paid $1 at the local electronics shop for the UART and 3 female to male breadboard cables and just placed the pins in the provided holes on the board. Worked fine.