Editing Nintendo Switch Trinket Guide (section)

=== Updating Horizon (Advanced Method) ===
If you ''do not'' use AutoRCM, then this mod does not interrupt the normal usage of your console in any way. You can ignore the following lines safely. If a new update is released that atmosphère doesn't support, you will still be able to boot into stock just like any other Nintendo Switch.

If you have enabled AutoRCM, you now require your console to have a microSD to boot at all. If your console does not have a microSD, you will not be able to chainload into Hekate to boot neither stock firmware, nor custom firmware.

You will no longer be able to boot into a truly stock configuration until AutoRCM is disabled. ''This is generally not an issue unless Nintendo releases an update that atmosphère cannot boot.'' In that circumstance, you should postpone the update until a new release of atmosphère is available to support it.

''If'' you require the update immediately, or you accidentally updated  -- disable AutoRCM and boot into stock, in the meantime. Custom firmware will no longer work on the ''updated'' NAND, but if you have an emuMMC on an older software version that atmosphère supports, it will continue to boot custom firmware without issue.

For clarification, using custom firmware while online is ''not'' and never has been a bannable offense. Piracy, and creating unsafe environments online (i.e. cheating, custom profile pictures) ''are''. As long as you avoid these, then there is no issue with permanently booting into custom firmware and swapping between emuMMC and stock via the modchip. This is the configuration I have always used, and I have not used a stock firmware ever since 2019.