I have updated my A9LH using this guide, but now I find that although Luma3DS and various tools like Emunand9 will boot okay, the Gateway payload and CtrBootManager9 will no longer boot (I get stuck on a black screen). Can someone tell me why this is happening, and what I can do to fix it? [Edit] Just found this tutorial. I can now chainload GW via Luma at least. It also recommends a different boot loader, I'll try that next.