Here's a rundown of what you should do:
1) Install rxTools and run the browser exploit to install the MSET payload for rxinstaller.bin.
http://dukesrg.github.io/?rxinstaller.bin
2) Get the sysupdater cia and toss it on the root of your SD card.
https://github.com/profi200/sysUpdater/releases/tag/0.4.2
3) Google "[MEGA] [CIA/BIN] MSET 4.X & 6.X backups, Browser backups, Update packs (All Regions)". Download the appropriate 9.2.0 pack for your region. Put all the CIA files into a folder called "updates" on the root of your SD card.
4) Boot into rxTools thru the DS profile exploit, hold L during boot.
5) Go to "Inject FBI", select sysNAND, check only. Write down the number.
6) From the rxTools folder, go to fbi_injection and open the folder that matches the number you wrote down earlier. Copy the 2 files to the root of your SD card.
7) Boot rxTools and go to "Inject FBI" again. This time, inject it to your sysNAND. It will prompt if you want to backup, select yes.
8) Select "Pasta mode" to boot into your sysNAND with patches. Open the health & safety app and FBI should start. From there, install the sysupdater cia.
9) Close FBI and start sysupdater. Select update when prompted and after a couple minutes and a reboot you should be on 9.2.
From there, I recommend you to install menuhax to cold boot into cfw/gateway. You'll have a lot more options to boot homebrew.