So! There's a couple of ways of doing this that I know of; both require a Cobra CFW.
Method 1 - Rebug!
Quite frankly, Rebug's newest CFW on 4.65 is awesome, so you should have this already, but it isn't region-free out the box.
Step 1
Download and install 4.65.2 of Rebug CFW. Install using recovery menu if possible, as that will reset settings and making it less likely to mess settings up (RSoD).
Step 2
Install the rebug toolbox, the PKG should be on the hard drive. If it's not there, download the PKG from the internet and install it from USB.
Step 3
Go to the Selector tab, and change System Mode to Rebug. Then change Debug Menu Type to DEX QA.
Step 4
If you haven't already, enable QA Flag in the last tab of the Toolbox.
Step 5
Reboot your PS3, then try running your "foreign" Blu-Ray
Method 2 - Rogero Cobra 4.46
Another great CFW that was only recently surpassed by Rebug, this also works with changing your region.
Step 1
Download and install Rogero 4.46 Cobra CFW
Step 2
Download and install Multiman or Multiman Cobra (the vanilla one will change to cobra when you update).
Step 3
In the Multiman settings, look for Blu-Ray Preferred Region, and set it to the region of the disc you want to play.
Step 4
Run the blu-ray disc from Multiman!
Method 1 is better than Method 2 because it means you can run any disc without having to run MM or change any settings.
Hope this helps people who were in the same situation as me! (CECHA00 trying to run Region B discs)
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