But A9LH was already starting really early when booting. So what does Boot9Strap give to a normal user? How does it work? Is it even harder to remove by Nintendo? A9LH was already impossible to remove by Nintendo (if you had a proper CFW which protected it, like Luma3DS).
B9S boots even earlier than A9LH.
B9S is easier for everyone to install than A9LH was, because you don't even need to downgrade anymore. All you have to do is run the Safehax exploit basically. It also makes it easier to recover from mistakes that may happen, such as not having a NAND backup when something goes wrong, but I haven't confirmed this personally.
I dunno how it works, saying "It exploits the bootrom" isn't gonna explain it in all honesty, sorry...
I should reword what I meant. B9S will never be patched on OFW systems. It requires a hardware revision to patch, so at no point will you ever not be able to reinstall it if needed, whereas A9LH needs an Arm9 exploit, which can be patched easily. Whether it's harder to remove is unknown to me.
Basically: B9S is better than A9LH when you are installing either for the first time. A9LH is outdated because you can't install it on OFW 11.4, whereas with B9S, you can. B9S is also a lot safer to install than A9LH, not requiring a CTRTransfer down to 2.1.0.
This is the reason everyone is jumping ship from A9LH to B9S. It takes like 5 minutes to upgrade to B9S, it's a lot safer to install for new people, and can be installed on more FWs, and is literally unpatchable on any existing 3DS atm. It provides no benefit to people who have A9LH, it would just be annoying for devs to have to support an outdated, inferior exploit for no other reason than "well B9S doesn't provide any benefits to the end user that A9LH doesn't already have."
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Edit: It does provide you benefit, just not a lot. That last bit was just explaining moreso why everyone is upgrading. Feel free to stay on A9LH if you want.