RK3399 bricked after connecting M.2

cdslashetc

I have a Mac so have to use Windows VM then connect the USB to the VM. After booting with M.2 SSD, the blue light no longer comes on and I can't get the board into recovery mode even after removing M.2. I can get into MaskRom mode by shorting the jumper as shown, but shows "Download failed" when I try to flash.

I'm hoping these more detailed instructions for MarsBoard will provide some clues--NOT the jumper though that is different--but explains how to flash only certain partition by check/uncheck boxes on the first tab. It may be necessary to press what they call "Restore" button after entering Maskrom (Recovery?) then may be able to flash it.

http://www.hotmcu.com/wiki/Flash ... g_The_Rockchip_Tool

http://www.hotmcu.com/wiki/Unbrick,_fix_NAND_on_the_marsboard

Would be interested to know if there is a way to boot from SD or other device instead of NAND or to flash via serial.