Tutorial 

How To Dump OTP.bin If You Lose It After Installing A9LH

While the OTP isn't really needed once A9LH is installed, if the file is lost, than here is a guide to get it back if you really want it.

1- Back everything on your SD Card to a folder on your PC. Then launch Hourglass9 and make a NAND backup. Then rename it to sysNAND-A9LHAX.bin as well as sysNAND-A9LHAX.bin.sha and put it somewhere on your PC.
2- Follow these steps https://3ds.guide/9.2.0-ctrtransfer , then restore your original Health and Safety through Decrypt9. (Should be named "hs.app")
3- Download SafeA9LHInstaller and copy all the files to the root of your SD Card, even replacing arm9loaderhax.bin.
4- When your system boots up, press the button to uninstall Arm9LoaderHax.
5- Then when your system boots up, follow https://3ds.guide/ and get to the point where you downgrade to 2.1. Then, download OTPHelper https://github.com/d0k3/OTPHelper/releases and extract all the files and folders to the root of your SD Card. Now, follow these steps.
  1. Go to http://dukesrg.github.io/2xrsa.html?arm11.bin on your 3ds
  2. OTPHelper will launch, then select the "Dump otp.bin (0x108)" option
  3. Go back to the main menu, then Select the "Dump otp.bin (0x100)" option
  4. Press Select on the main menu to eject your SD card
  5. Put your SD card in your computer, then copy over otp0x108.bin and otp.bin to a safe folder on your computer.
  6. Ensure that otp.bin is 256 bytes and otp0x108.bin is 264 bytes
  7. Backup otp.bin and otp0x108.bin to multiple locations (such as online file storage)
7- Next, follow these steps.
  1. Reinsert your SD card into your 3DS then press B to return to the main menu
  2. Go to "NAND Backup & Restore"
  3. Restore SysNAND from sysNAND_A9LHAX.bin
  4. Cross your fingers
  5. Reboot!
8- Now, format your 3DS's SD Card (MAKE SURE THE OTP AND ALL THE NAND BACKUPS ARE ON YOUR PC!!!) and copy over all of the files you backed up in Step 1 on your PC to the root of your SD Card.

And that's it! Also, credit to Plailect for parts of Step 5 and 6.
 
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    yall im torn... ive been hacking away at tales of phantasia GBA (the USA version) and have so many documents of reverse engineering i've done
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    I just found out that the EU version is better in literally every way, better sound quality, better lighting, and there's even a patch someone made to make the text look nicer
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    Do I restart now using what i've learned on the EU version since it's a better overall experience? or do I continue with the US version since that is what ive been using, and if someone decides to play my hack, it would most likely be that version?
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    @TwoSpikedHands, I'll preface this with the fact that I know nothing about the game, but, I think it depends on what your goals are. Are you trying to make a definitive version of the game? You may want to refocus your efforts on the EU version then. Or, are you trying to make a better US version? In which case, the only way to make a better US version is to keep on plugging away at that one ;)
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    I'm not familiar with the technicalities of the differences between the two versions, but I'm wondering if at least some of those differences are things that you could port over to the US version in your patch without having to include copyrighted assets from the EU version
  • TwoSpikedHands @ TwoSpikedHands:
    @Sicklyboy I am wanting to fully change the game and bend it to my will lol. I would like to eventually have the ability to add more characters, enemies, even have a completely different story if i wanted. I already have the ability to change the tilemaps in the US version, so I can basically make my own map and warp to it in game - so I'm pretty far into it!
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    I really would like to make a hack that I would enjoy playing, and maybe other people would too. swapping to the EU version would also mean my US friends could not legally play it
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    I am definitely considering porting over some of the EU features without using the actual ROM itself, tbh that would probably be the best way to go about it... but i'm sad that the voice acting is so.... not good on the US version. May not be a way around that though
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    I appreciate the insight!
    TwoSpikedHands @ TwoSpikedHands: I appreciate the insight!