NOTE: Recommended to update MultiMan to 4.82 before updating your CFW!!
Step 1: After Downloading the file above, Take a USB thumb drive of at least 1GB in size and connect it to a PC. On the root of the drive create a folder called "PS3" (no quotes) and inside the PS3 folder create a folder called "UPDATE".
Step 2: Copy the REBUG_4.82.1_LITE_PS3UPDAT.PUP to this folder and then rename the files PS3UPDAT.PUP Disconnect your USB and plug it into your First USB drive all the way to the left on your PS3.
Step 3: Go to System Settings and select System Update and scroll to Update Via Storage Media, Select the Update and allow it to install. First it will copy to your console and then install. Could take about 15 Minutes.
Step 4: After Reboot you will be running CEX base 4.82.1 REBUG CFW and if you havent already you can install the new 4.82 MultiMan Via the Packages manager.