Here is how to make OTG to work. Just sold one capacitor onto USB PCB. 1uf 16V X7R size 0603. You can ask your friend to do that in a half of hour with beer drinking.
After that external HDD works at 10MB/s without external power
Seems to be. I got the usb - replacement board in december via mail. The replacement action according to the youtube viedeo wasn't very difficult. And it works now like a charm