Download image to RAM now

In BootLoader command have an option - D) Download image to RAM now.

After enter this option, “EbootUSBPreDownload: called!” on PuTTY screen. And “Sent BOOTME …” again, again.

I have try use Platform builder (VS2008) - attach device to attach Apalis T30, I had do this similar procedure on the CEPC device a lots. Look like I must missing some setting.
I try to find the “Document”, however, could not find it.
Please point some document for me that is a big help.

Thanks
Lu

Dear @yudiannlu

Please refer to the related question Platform builder to build a NK.BIN/NK.nb0.

Regards, Andy