My 3DSLL is 4.4 with GW(414) I had been installed A9, I can successfully boot into sys system( L + power), but when I tryed to boot with emu system( power with no other button) it had an error then I gave up emu system and directly install B9 following this guide https://3ds.guide/a9lh-to-b9s And I have another error Now I cannot enter system but only D9/godmode/SafeB9Installer/etc. My files are latest. My question is how can I install B9 rightly? Or how can I roll back to A9 that at least I can enter system. I've tryed http://gbatemp.net/threads/problem-with-boot9strap-installation.471198/#post-7320771 and a "b9s-next branch version" method, but it didn't work. (I also wonder why my a9 emu system could have that error...) And sorry for my bad english. Thank you guys.