This guide assumes you have access to RCM, if you do not, use a compatible method. Some of those compatible methods can be found here.
This guide will transform your stock switch to play "backups" of switch games
1.) Installing ReiNX

• Download the latest stable ReiNX Release (Found here) (Extract this on to the root of your SD)
• Make a new folder in the /ReiNX/ directory on your SD named 'titles'
• Download hbmenu.nro (place this on the root of your SD)
• Download this .zip file and extract it to /ReiNX/titles/
• Download the latest stable release of Tinfoil(Found here)
• Create a new folder on the SD's root named 'switch'
• Place tinfoil.nro (found in the tinfoil zip) in the /switch/ directory
• Make a new folder on the root of the SD named 'tinfoil' and inside this folder create another folder named 'nsp'

*From now on any NSP warez or homebrew you download should be placed in /tinfoil/nsp on the SD card.

2.) Booting into ReiNX
*Skip this step if you are familiar with booting into CFW

• Use your method of choice to enter RCM
• Push ReiNX.bin from the ReiNX.zip we downloaded earlier to your switch. (If you do not know what app to use to do this i reccomend TegraRCMGUI for Windows users.)

3.) Installing Games

• Open the homebrew launcher by opening the Nintendo Switch Album
• Open tinfoil
• Choose Title Management>Install NSP>(Choose the NSP you would like to install)

Profit! Enjoy your "legally obtained backups"

FAQ:

- Can I delete .NSP files from my SD after they have been installed via tinfoil?
Yes you can.

- Will I get banned for going online?
Yes, you will most likely be banned from playing online with your switch. This in fact does not block updates though, and you can still access the eShop. (I strongly suggest you keep your switch in Airplane mode and de-link your NNID if you plan on using CFW to install a bunch of NSPs.)

- Can I install updates or DLC with this tool?
Not with tinfoil currently, you have to install devmenu to install DLCs and game updates. See here: https://gbatemp.net/threads/quick-g...ates-dlc-with-devmenu-no-sx-os-needed.512337/

- Can I convert .XCI to .NSP?
Yes. Use this.

- Do i have to use the album to launch into the homebrew launcher?
No. You can install this via tinfoil and launch the homebrew launcher as if it is an app if that pleases you.

- I wish i could backup my saves so that i don't lose them...
Download checkpoint.nro and use it to backup your saves/import saves from another switch.

- Can i install any homebrew to my main menu with this?
Pretty much. Check this out.

- How do i update ReiNX?
You can update it manually by downloading the latest release and extracting it to the root of your SD card, or use this updater homebrew application. (Recommended you use that homebrew to decrease hassle every time you want to update.)

 

[Gimzie]

Thing is, I'm fairly sure you'll get banned even if you don't play online, so might want to make it more clear that unless you really don't care about online play, this guide isn't for you.

 

[SaffronXL]

It might have something to do with the fact that your console is not on 5.1? I started at 5.1 and what is listed here works fine for me.

Yeah, that's what I'm afraid of. I guess there's only one way to find out, but the guide to update without burning fuses is... not brief, to say the least.

 

[TR_mahmutpek]

How to download/launch reinx? I mean I cant find any release on github. And should I launch via hekate ctcaer mod?

 

[IHOP]

How to download/launch reinx? I mean I cant find any release on github. And should I launch via hekate ctcaer mod?

Download links in OP. Everything you need can be found there. Launch reinx like any other RCM payload.

 

[TR_mahmutpek]

Download links in OP. Everything you need can be found there. Launch reinx like any other RCM payload.

Found it. Thx for info!

 

[Minikea]

posted on tinfoil thread instead:
https://gbatemp.net/threads/tinfoil-title-installer-manager-by-adubbz.511763/page-18#post-8164345

 

[SaffronXL]

I did the fuseless 5.1 upgrade and... holy crap, it works!!! Thank you to everyone involved!

 

[IHOP]

I did the fuseless 5.1 upgrade and... holy crap, it works!!! Thank you to everyone involved!

Looks like this is a 5.1 only thing, glad to hear everything is working for you.

 

[naddel81]

I did the fuseless 5.1 upgrade and... holy crap, it works!!! Thank you to everyone involved!

Doesn't ReiNX preserve fuses when updating anyway?

 

[SapphireExile]

805 error, failed to install. Something I'm doing wrong?
*Edit MK8 failed with 805, but Fire Emblem worked just fine with no issues.
Testing if it's my backup later.

 

[Fadi5555]

In the ReiNX disscusion thread i made a comment on installing .NSP files with ReiNX and TinFoil that seemed to help a lot of people. Thought i would compile more info in a dedicated post so that it was not lost in the swarm of the discussion.

Important: .XCI files are not supported nor is there a current way to convert a .XCI to a .NSP file. This may change soon.

In order to install backups using ReiNX you must do the following:

• Download https://www62.zippyshare.com/v/bEiUbDme/file.html
• Make sure you have 'hbmenu.nro' on the root of your SD, if not you can find it at https://github.com/switchbrew/nx-hbmenu/releases/tag/v2.0.0
• Download tinfoil at https://www.dropbox.com/s/u1sflqgs0bi2bgg/Tinfoil.nro?dl=0
• Place NSPs in /tinfoil/nsp
• Launch ReiNX with TegraRCMSmash or other application of choice
• Open HBL by going to 'Album' On home screen
• Open tinfoil
• Install NSP with tinfoil
• Enjoy!

FAQ:

-Can i delete .NRO files from my SD after they have been installed via tinfoil?
Yes you can.

-Will I get banned for going online?
Yes 99.9% chance you will be banned from playing online with your switch. This in fact does not block updates though, and you can still access the eShop.

Is there any plans for support xci?

 

[TR_mahmutpek]

I cant launch reinx, after inject payload, stuck on blue screen wtf?

 

[Maoh]

I cant launch reinx, after inject payload, stuck on blue screen wtf?

It doesn't works on 4.x apparently, there is a simple way to update without burning fuses on the forums, I already did it and it's working flawlessly, in fact it makes me wonder why haven't I just updated in the first place.

 

[TR_mahmutpek]

It doesn't works on 4.x apparently, there is a simple way to update without burning fuses on the forums, I already did it and it's working flawlessly, in fact it makes me wonder why haven't I just updated in the first place.

THX for info! Saved my time and why op isnt stated that before?

 

[Maoh]

THX for info! Saved my time and why op isnt stated that before?

It's still dubious, no one is 100% certain but at least for a bunch of people (me included) the only difference between getting reinx to work and a blue screen was the update.

 

[saito1234]

so does that mean that backups can be run now without the need to buy the SX OS?

 

[Ashura66]

so does that mean that backups can be run now without the need to buy the SX OS?

It's a more involved and complicated process but yes. Though using this method you can't install updates or DLC just yet

 

[SapphireExile]

It's a more involved and complicated process but yes. Though using this method you can't install updates or DLC just yet

I installed the update just fine, via official channels. I've yet to try DLC with tinfoil though.

 

[Wednesday101]

im seeing mixed results with 4.1 users. Any confirmation for this working on 4.1?

 

[Ashura66]

I installed the update just fine, via official channels. I've yet to try DLC with tinfoil though.

Well trough official channels of course it's going to work though you do have a huge ban risk from that obviously. But i think i read on another thread that Tinfoil is incompatible with DLC installing for the time being, devmenu is the only unofficial way of doing that