Thanks for all the info. I didn't quite get all of that but I'll research it. Off all the things I understood it made me uncertain if I can actually downgrade my 3DS... I was going to follow a guide which made the process seem very simple, but now it doesn't seem so easy. Well now I'm confused...
- Download SafeSysUpdater, the 9.2 official dowload pack from that iso site for your console and region along with the HomeBreweLauncher 2.6 starter pack.
- Create a folder on your SD root and name it 3ds. Create another folder on your SD root and name is updates.
- Extract the 2 files from the SafeSysUpdater .rar pack. Paste those 2 files into your 3ds folder.
- Copy and paste all of the .cia files from the 9.2 firmware pack into your updates folder. It is important that all of the .cia files are in the updates folder.
- Extract the HomeBreweStarter.rar. Copy and paste all of the folders on to the root of your SD card. Click yes to overwrite any matching folder or file names.
- Insert the SD card back into your console.
Now follow the BrowserHack guide on this site. This exploit will allow your system to run HBL.
- Once you have the HBL menu appear. Select SafeSysUpdater.
- Your console should now be in SafeSysUpdater. Select the option to check your downgrade firmware files. Once the checks have ALL passed. Proceed on to Entering SafeSysUpdater again.
- Hook your charger up first. Now Select the option to downgrade your console. Sit back and keep your fingers crossed that the downgrade completes. Once SafeSysUpdater has finished installing the 9.2 firmware .cia's. It will attempt to reboot your console after 10 seconds. Let it do it's thing. If after 10 seconds have passed and your console still hasn't rebooted. Hold the power button down until your console shuts off. At this point, power your console back on. If your console doesn't boot past a black screen. Simply power down again and remove your SD card. Now power your console back on. If the console boots correctly. Enter settings to verify that your console is now running 9.2 firmware. If it is, come back here and reply so I can help you out further. If not, you'll either have one of the 3 below outcomes.
1 - FrankenFirm; the downgrade didn't fully install your NATIVE_FIRM. Don't panic, just boot back into HBL if you can. Then enter SafeSysUpdater and downgrade again. This time, SafeSysUpdater will downgrade your NATIVE_FIRM. Again, let SafeSysUpdater reboot your console. If it doesn't after 10 seconds have passed. Power down manually and remove your SD card, then power your console on.
2 - Soft Brick; while your console is powered down. Hold L, R, A and UP on your dpad. While holding those buttons, power your console on and hold them until you see the recovery menu. When in the recovery menu, your console will prompt you. This message prompt will say something along the lines of you having to update your console. Accept and let the recovery process complete. If this happens to you. You must come back to this thread and let one of us members know. We will have to give you another exploit method which will involve you having to either own Cubic Ninja or Zelda: Orcarina of time.
3 - Hard Brick; If none of the 2 outcomes above didn't help you identify your problem. You will most likely have a bricked nand. The only way to recover this is to hard mod your console and write your nand back to your console. This will recover your console from a hard brick. Please note; you must have a hard mod installed pre downgrade. Why? Because you will need to read your nand before it became corrupt (hard bricked).
I may not of covered absolutely everything above. If others would like to chime in and add something to the above. Please feel free.
Lastly, good luck to you. I wish you all the best during this downgrade process. FYI, if you can do this, you'll find that installing A9LH is that much easier.