If you've installed A9LH or Boot9strap (which you would have done if you fully followed a guide such as https://3ds.hacks.guide), it is safe to update.oh
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What happens if I got a mod for 11.6.0-39u but then there was a system update???
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I found a website that y'all should check out
https://smealum.github.io/3ds/
I don't know the tutorials for it
As for smealum's website, we've known about it for at least three years now (probably longer - I don't remember for how long he's had the 3DS page on his Github site open).