As a Gateway user, you might want to wait a few days/weeks/months for the next update that is in closed beta right now and that is supposed to come out on Sunday (probably will be delayed as they are reportedly having some issues). This will enable you to use the latest and best exploit entry point called A9LH (for arm9loaderhax).
For your friend, you probably want to setup A9LH directly, since he is on 9.2. This will enable him to load CFW from SysNAND directly, install CIAs and stuff, have brick protection, stock-like boot and 100% boot rate, and also be on the latest official firmware.
You can follow this guide for more information:
https://github.com/Plailect/Guide/wiki (more specifically, you can start from
part 3 since he's already on 9.2, but I encourage you to read the whole thing).
You can of course follow the guide for your 2DS too, if you don't want to wait for the Gateway update.