can you explain more details this part?
my sysNand is 10.7 CFW AuReiNand & emunand 9.2, how you did A9LH setup again?
what flag need to remove?
Well, if you have your arm9loaderhax.3dsx (the arm9 hax installer) you can set your A9LH easily again.
-Flash your sysNAND (your original 9.0/9.2) back to your sysNAND, put your emuNAND 10.7 back on your SD, prepare your HAX* (browserhax, ninjhax, etc), put your arm9loaderhax.3dsx again inside your 3ds folder.
-Go to your rei folder and remove this file (if you have one)
updatedsysnand (this is the file that tells your A9LH and AuReiNand to boot directly to your sysNAND instead of your emuNAND).
-Put firmware.bin and firmware90.bin inside rei folder
PS: REMOVE ANY NAND.BIN and emuNAND.BIN file from the root of your SD card before
-Now follow the last part of your A9LH tutorial (the part that tell you to run arm9loaderhax.3dsx)
This will setup A9LH again to your sysNAND 9.2 and since you removed the
updatedsysnand flag you'll boot to your emuNAND instead of sysNAND.
If you want to boot your sysNAND 9.X turn your console on while holding L. This will allow you to have access to firmware 9.X and Homebrew Loader, from which you could access GW.3dsx and boot Gateway emuNAND.
This is what I have done and both A9LH and gateway are working flawlessly here for me.
Cheers!