oh well my bad most people that are trying to change prl's are trying to change carriers,so your already on the carrier, so you wont need to change the sid.there are a few tools out there to auto compile deb files,you can build a deb on your mac,pc or right on your phone.i would suggest to use one of the auto compile tools or have you tried to google for a .deb with your prl already in it? never know someone might have saved you the trouble already.a deb is basically a series of folders with a control file,there is alot out there on building deb files.you could probly replace your prl with one from an existing deb without doing to much work.