Fuses are designed to prevent downgrading. While you can theoretically downgrade with the current RCM exploit because all bootloaders bypass the fuse check (and now bypass the warmboot fuse check when waking up out of sleep mode), it becomes redundant to downgrade. The reason being is that the main purpose of downgrading in the first place is to take advantage of an alternative exploit that doesn't make use of a jig and USB cable.
Also what was recently released was a writeup on browserhax on 4.1-6.0 aka PegaSwitch which would only allow for homebrew. Deja Vu has still only been confirmed to work on 4.1 and below which would give rise to CFW.
Anyway, its up to you if you want to hold onto your fuses in case Deja Vu or another exploit comes out on lower firmwares. In order to prevent your fuses from being burnt, AutoRCM is used which prevents your console from booting up normally. The reason being is that booting the console up normally would burn fuses. Since it cannot boot up normally anymore, it can now only be turned on after sending a payload in RCM.
Lastly,
ChoiDujour is a Windows program used for installing firmware updates via RCM but doesn't support firmware 6.2 and can take up to an hour.
ChoiDujourNX is a homebrew application that has the same job as ChoiDujour but runs on your Switch and does support firmware 6.2 as well as taking a few minutes to do its job. Learn the differences and you can save yourself as well as others a lot of time down the road.
The cartridge slot is updated once you are running a firmware of 4.0 or higher. Once its updated, it will no longer work on firmwares below 4.0. If you've run a firmware of 4.0 or higher without the nogc patch (which breaks the cartridge slot thereby preventing it from being updated), then your slot has already been updated.
If you update online, you will burn fuses because after the system update is finished installing, it will reboot your console which will subsequently burn fuses. A risky option you can go for is trying to boot back into RCM when the console is rebooting by inserting a jig and holding volume + but of course the success of this would rest entirely upon the jig. You also would only have one shot at this as if the jig fails to short pin 10, then you will not enter RCM and burn fuses. Another alternative is to install the update while running a version of Atmosphere 0.8.0 or above with AutoRCM enabled. Atmosphere now prevents system updates from removing AutoRCM so if you download the system update onto your console then install it while Atmosphere is running and you have AutoRCM enabled, your console will reboot back into RCM and your fuses will be safe.
- ReiNX is moving towards becoming the free version of SX OS so whatever features SX OS has will naturally become integrated into ReiNX as more progress is made on cracking it
- Unfortunately there is not. What I recommend doing is by grabbing the Tinfoil build that ends in 883e from the bot that builds the commits which has the most success with Aluminum Foil