Do not use the RK 1.7 from Energy (never worked for me either), use the 1.2 one in this post
https://www.mobileread.com/forums/sho...89&postcount=1. Worked for me every time. I experimented a lot with the kitchen with my pro+ when I got it and had to reflash the energy pro+ original FW some times, now I am happy with the FW I have (C67).