hi, thank you for the a9lh guide, its amazing, however, I would like to ask if you could add something to it:
The firmware.bin from NTR should be place on luma folder before downgrading the emunand to 2.1, a lot of people has been having multiple fail downgrades (search for 2.1 fail posts), and having the firmware there did the trick for them, I can confirm this out of my own experience.