previous release, today PlayStation 3 developer Endless officially updated to PS3MFW Builder v1.0 Build 0.3.1.5 and PS3MFW Builder Updater v1.5 which includes the PS3 Firmware 4.80 keys for making your own PS3 Modified Firmware.
Download: PS3MFW Builder v1.0 Build 0.3.1.5 / PS3MFW Builder Updater v1.5 / PS3 MFW (All Releases) Archive / PS3MFW Builder Site / GIT
Coded from scratch by Endless. Better, faster. Intergrated updater (if version is older)/downloader (if ran alone)
Thanks for downloading
Replace the old updater by the RazorX by this one
Thanks to @Endless for the update and changelog, and @XxZer0ModZxX for testing it out!