Hi. I am the creator of XMBPD. It was ONLY designed for Rebug 4.78 like the source (psx-place) and all the warnings say. That is why the pkg name is "XMBPD_v0.20.00_
Rebug_4.78_Only" and why I included a warning written in red in the installer saying this is ONLY for Rebug 4.78 and needs CFW tools enabled while installing.
It would support any Rebug FW down as low as 4.70 but it makes the package much bigger and it makes a lot more work porting it to the lower FW's. So Ive decided to only support Rebug 4.78. I see no reason for anyone to be staying on 4.70 and if you want new features you will have to update to newer FW, just like with official FW.
Note: If you install this on CFW other than Rebug you will need to reinstall FW from recovery. (make sure to remove any disc from the bluray drive first)