I have same problem at R5C but with some difference. My R5C could connect as MASKROM mode and eMMC can be erased but not boot from SD card nor eMMC at all.

Hi , I have a problem with a bricked NanoPi R5C after doing the unbricking method from wiki.friendlyelec.com this device won't boot from either SD nor eMMC. I tried to update with USB A-to-A cable but failed after programming. Any ideas? This problem happened right after I decided to transfer my OS ...

I also have same problem with different type. My R5C after use unbricking method described in wiki bricked and not either boot from SD nor eMMC. can any body guide me. I use RKDevTool for program eMMC from official images but not worked.