Theres an option to install from usb in recovery.. You cant install from usb if you use the "updates" section in settings.
Just to make sure I don't do anything stupid.:
1. Will flash from recovery using USB
2. I'm downloading the following - update_5_1_1_FUSE_800X480_RK3188_04_MAL_12_09_2016_MTCB.rar
If I understood the thread and instructions correctly, this is all I need and should be good to go. Any advice is appreciated. Cheers.