don't uninstall a cIOS. if you want something else, just overwrite it.
You can install an IOS into a lot > 200 by editing its slot number with a program (dump IOS to wad > edit slot number > install edited wad)
But I wasn't sure the "clean IOS" would boot the game fine. I tried to use official IOS to launch NAND channels and failed. I wasn't sure it would work for disc.
I didn't thought about using cIOS 236 (which is just IOS36 with trucha bug patched), thanks for testing that
so now we can confirm the problem is not the patch, not the loader, but the IOS itself.
d2x is probably not working with your patch. using IOS(2)36 is a good alternative.
I don't remember which official IOS slot that game is using.
I need to add the option to use "requested IOS" to channels and discs for a long time, sorry that I couldn't do it before. I don't know when I'll get the time to fix it.
until then, installing cIOS 236 (or installing the requested IOS in a slot above 200) is a solution.
another solution is to remove the IOS slot restriction and allow the use of lower slots (it's cleaner than messing with wad and slot install).
DO NOT TRY anything relating to patching 36 or whatever using d2x or waninkoko patchers.
"base 36" is not the solution, the solution is to not use d2x/waninkoko IOS.
maybe Hermes IOS would work, I don't know why you couldn't launch the game. Try to use v4 or v5 base57 instead of 37+38