Originally posted by abz247uk
Download the 1.3 patch, and download the 1.2 patch.
Open up both using a hex editor. Now copy all the hex in the 1.2 patch and paste and overwrite all the hex in 1.3. Save the 1.3
Try installing the 1.3 patch now using ps3 proxy.
Or you could just replace the url of the 1.3 patch with the 1.2 patch on your PC in PS3.proxy and then try and download it. It wouldn't affect the pkg's encryption, but the PS3 may not authenticate it....
I would try it, but I can't find a 1.2 BLES00148 patch... ANYWHERE :p