不过从成功者名单里竟然还有人从9.2升到10.5再硬降到10.2再降级的

希望有奸商能研究下，给10.5降级点希望

普通人还是别试为好

先去蓝翔学焊接吧

翻译一下

想必

This is crossposted from reddit.
This is a summary / compilation of the information from this thread. Please don't follow any random instructions you find on that thread, there is quite a lot of misinformation going around. This is very much untested and a hardmod is necessary.
Do not ask if you can achieve this without a hardmod, you can't.
This is an apparently working implementation of the "FIRM partitions known-plaintext" exploit detailed here. Reports of successful downgrades are sparse or unconfirmed, but seeing as anyone who tries this has a hardmod and a NAND backup (hopefully multiple backups kept in multiple locations), there isn't really much that can go wrong.
This should work on both a New and Old 3DS.
Keep in mind throughout this that 10.4 and 10.5 use the same NATIVE_FIRM. Also keep in mind that 10.3 does not have a unique NATIVE_FIRM, and we will be using the 10.2 NATIVE_FIRM.
~
What you need:
Your 10.4 or 10.5 NAND extracted using your hardmod
Raugo's autofirm

https://github.com/Plailect/3DS-10.5-Downgrade

https://mega.nz/#!8lFwxaTA!uxag4JB3wFgI6nPwrwWuwU8lKYsGxO7AjfpARr0Q8HQ
取备份重新打包工具

msvcr120d.dll
https://drive.google.com/file/d/0BzPfvjeuhqoDZGR5M21ScWtoUEk/view?usp=sharing

步骤
. Extract the autofirm pack to a folder of your choice
2. Place a copy of your NAND file (named "nand.bin") in the autofirm folder
3. Download the appropriate decrypted 10.4/10.5 NATIVE_FIRM and the decrypted 10.2 NATIVE_FIRM as CIA files
4. Rename the 10.4/10.5 NATIVE_FIRM file to "firmoriginal.cia" then put it in the autofirm folder
5. Rename the 10.2 NATIVE_FIRM file to "firmnuevo.cia" then put it in the autofirm folder
6. Place the msvcr120d.dll file in the autofirm folder
7. Run "start.bat"
8. If everything worked, then you will have a modified "nand.bin" containing 10.2 NATIVE_FIRM on 10.4/10.5
9. Flash this "nand.bin"
10. Get access to the homebrew channel (Starter kit here) (Mirror)
11. Downgrade to 9.2 (Mirror)

脚本不支持自动浏览器。。。

第一步，拆机取10.5备份，最关键。
有备无患。