MSET9 is currently the only exploit for 3DS / 3DS XL / 2DS consoles on firmware 11.17.0 that is free and does not require any software. If you're unable to use it, you'll need to use one of these methods, which all 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:
Continue to [Installing boot9strap (smilehax-IIe)](installing-boot9strap-(smilehax-iie)). If you have the Japanese version, continue to [Installing boot9strap (smilehax-IIe-jpn)](installing-boot9strap-(smilehax-iie-jpn)).
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.