3DS / 3DS XL / 2DS consoles on firmware 11.17.0 do not currently have any free, software-only methods. Therefore, all of the methods here have some sort of prerequisite.
Because Nintendo eShop no longer allows purchases, it is no longer possible to purchase new titles. However, you can re-download a title if you had purchased or downloaded them before purchases stopped being possible.
Any one of the following titles can be used in conjunction with Seedminer to install custom firmware:
This method uses another 3DS with custom firmware and a digital or cartridge copy of Mario Kart 7.
Continue to [Installing boot9strap (kartdlphax)](installing-boot9strap-(kartdlphax))
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#### ntrboot
This method requires a compatible DS flashcart to be flashed with ntrboot, which works on all 3DS-family consoles regardless of model or region.
If none of the above options are available to you, this is the cheapest available option. If you don't already have a compatible cartridge, a preflashed ntrboot-compatible cartridge can be purchased [here](https://www.nds-card.com/ProShow.asp?ProID=575) for roughly $20 USD.