1. Download the Gateway 4.2 Beta Zip and the Time Machine Pack for your 3ds (old or new, Region Specific) fromhttps://scmods.com/gw_guide/GWFB-1.0.pdf this is the link, thanks for your reply, and yes, its the fast boot
http://www.gateway-3ds.com/private-beta-program/
2. Copy the TimeMachine Pack and the contents of the “Console SD” folder on to root of your consoles SD card and contents of the “Red Card uSD” folder on to root of your GW Red Card uSD
3. Load Gateway Menu Holding "L + Select" during Boot
4. go to Gateway Mode the hold "B" while pressing A to boot into SysNAND Gateway mode
5. Push Select to bring up the GW OSD and load Timemachine
6. go to update to v10 and let it finish
7. When it finishs the GW A9LH will be gone and your on System 10.3.0-28