If is on 2.1 follow step 4 of getting the otp.bin from the system before doing anything else.
So, to sum it up. Please check if I understand. Firstly, im doing what is written on https://github.com/Plailect/Guide/wiki/Browser-OTP so I backup the otp file.
Next I need to update to 9.2 yeah? I dont understand how to do it, only with game which has 9.2? For the moment I have only Link between worlds (nintendo select edition), where can I check which update this game have?