Final Fantasy Hacktics

I'm sorry for the necro, but I haven't found much other discussion on the matter.

I am trying to mod the PSP WotL ISO instead of the PS1 original version. So I cannot use Attack.OUT editor or touch the individual GLS files. On a whim, I took a look at the whole ISO in HxD, since that was successful for my efforts adjusting the number of characters I can deploy. (Starting at 0058BF6A for PS1, 002F9AAE for PSP) But in this case, I cannot find any similar hex sequences in the PSP ISO like I can in the PS1 BIN to hand edit.

Has anyone successfully modified the lighting levels in WotL? Either with a utility that works on WotL ISOs, or hex editing, or CWCheats, or Valhalla ASM hacks, or otherwise?

I'm pretty new to the modding scene. Is there a way to convert that XML to work for the PSP WotL version instead of the PSX FFT version?

No matter what I try, I can't get Valhalla to make changes. I am trying:

1. Run Valhalla.bat
2. Setup files
3. Decode text files
4. Encode text files
5. Decode EVT
6. Encode EVT
7. Apply patches

Then I try running the patched iso, and there's no actual changes applied.
So looking back at the log, I see this:

Extracting fftpack.bin:
Done.
Extracting EBOOT.BIN:
Done.
Decrypting EBOOT.BIN:
Fail to decrypt EBOOT.BIN

How do I fix the decrypting? What is the prerequisite here? I the custom python distribution (from https://www.romhacking.net/utilities/1478/) deployed /python/ folder in Valhalla's folder structure. I did not modify the cfg file. I am editing an iso named fft-wotl.iso. But it always fails. Any recommendations?

Pastebin of the log: https://pastebin.com/SDuGAnHz