I noticed a difference in the opening_plugin.rco files between version 1.00 and version 1.50. I have a dump of the 1.00 firmware, and would like to flash this into my psp instead of the one that is already there. I have also tested the swapping of the files with the firmware launcher. I know that PSPset can switch the files, but not for this purpose (for the purpose of replacing the boot sound which is within the file). Would someone be able to tell me if this would work/test it out?