Hacking OTP/A9LH TWL Modification Help

[_Pro_Man_]

Hello everyone.
I am following Plailect's OTP guide I'm at step 36 where it says:

Remove any TWL modifications done to the device or PlaiSysUpdater will throw an error (if you have no idea what this is, don't worry about it; most users will not need to do this)

I'm 99% sure that I have some TWL modifications. I installed them trying to get an old ds flashcard to work. How would I go about removing these modifications. I'm assuming it is a cia file, but where would one obtain this file?

Thanks!

 

[SkyChotik]

Restore a backup from before the mods.

 

[Garro]

Personally I had bluecardfix installed on my Sysnand, which is a TWL modification, and the whole downgrade and OTP process went perfectly fine.

Now if you installed a patched TWL_FIRM, I guess you should redownload an unpatched one from the NUS that matches your nand version.

 

[astronautlevel]

Honestly, I had patched TWL_FIRM and had no problems with the downgrade.

That being said, if you want it's fairly easy to remove by using 3dnus to download a stock TWL_FIRM. You can find the title ID and version on http://3dbrew.org/wiki/Title_list