For those who can't access recovery mode. You were supposed to flash updated recovery image after flashing rrn rom.
Enter into fastboot mode by using adb shell.
Flash the updated recovery image
Now try rebooting into recovery.
I think that it is going to be stuck here with no future development for this. I mean it's nov 2018 with still no reply or any progress from the developers. I know it takes long time to do something for a device which doesn't even support this upd...