The dex sysconf_plugin.sprx would be useless to you unless you wrote custom code to use it because this sprx is not the only file you need to display the Debug menu on XMB.
If your console cannot run a CFW & your current firmware version is > 4.84, I don't think you can change the PS3 region, at least not with available tools.
To use the DEX files you need to be on 4.84 max because vsh.self is included in the revoke list so afaik DEX vsh 4.84 cannot be loaded by the 4.86 kernel & if your console is not CFW compatible, you cannot downgrade back to 4.84.
Like I said earlier, in theory, it should be possible to change the PS3 region without the DEX files swap but someone needs to reverse engineer that process so that we can make identical changes ourselves.
I never investigated that feature so I cannot tell you what those changes are.
If ps3 region changing is a permanent setting, those changes must be applied in regions that don't get overwritten by a firmware installation or system restore, which narrows the possibilities a little. I assume that the changes must be done in one or two of the following storage regions:
1. xregistry (/dev_flash2)
2. flash memory outside of ros regions
3. syscon
Those storage regions are the most likely candidates. We know that the TargetID is most likely changed (that is stored in Flash memory) & we also have know that the Xregistry contains certain region related settings but all this requires further investigations & testing.
I understand.
Yes, region setting is a permanent setting. I upgraded the firmware since I use the Ps3 for online playing (also Netflix, YT, Prime). I thought I could be able to revert region back to PAL when needed since HFW 4.86 was already out and I didn't know that it precluded some functions...
Anyway, installing HEN, I have access to some application equivalent to HAN Toolbox right?? So I can copy/extract files.
As I was saying I'll extract the xRegistry and change the region or video output to PAL. This should be enough for making Ps1-Pal-PSN games to work.