Homebrew developers The U.P.M.S. Team has released a new build for the UPMSInstaller, bumping it up to version 4. The application gives Sony PlayStation Portable owners a clean memory stick for a fresh install.

This is especially helpful when you want to upgrade after having a working Pandora or UPMS stick. In this way, you will no longer need to write the IPL on the stick again or install fatms371.prx.

The following changes to the installer itself and the ultimate loader in version 4 of the program were provided by The U.P.M.S. Team:

Installer

* You will need the following EBOOTS to the root of your Memory Stick before proceeding:
o 150.PBP
o 371.PBP
o 380.PBP
o 390.PBP
o UPDATE.PBP (Only if you want to downgrade to 1.50 Firmware)
o 340.PBP (Only if you want to Install Time Machine)
o 360.PSAR (Only if you want to Install Time Machine)
* New Improved Splashes
* New Improved visual install proceedure
* New Motherboard detection using Pommel, Tachyon & Baryon values. (Now displays your PSP model ie. TA-079.)
* New Displays the available free space on your memory stick which updates as the install proceeds.
* Renamed the Clean Nand items in Utilities menu, to stop confusion of people thinking it's installing the clean nands to the actual psp without creating a nand backup.
* Added 390 Kernel 150 Addon
* Removed writing of the full eeprom to the battery
* New Dark AleX's Time Machine IPL can now be installed from the IPL menu, this also installs the config file which contains the LTrigger for booting to UPMS. Now no need to convert Pandora's IPL or install the IPL, just launch Time Machine from the Utilities Menu then select the firmware you want to install.
* Disabled the battery menu for the latest PSP Slims V2.
* New Random Serial Generator for when you want to make your Pandora Battery normal, creates a randomly generated hex number.
* Now installs Despertar Cementerio V5 (TheJoker has had to be removed)

Ultimate Loader

* Firmware installation:
o 352M33 via Hellcats Menu
o DCv3
o DCv4
o DCv5
* New PSP Motherboard detection
* New Reboot to XMB option added. (TA-082 has troubles with display after reboot)
* Added Free Memory Stick Space for visual confirmation.
* Added Nand Backup direct from Ultimate Loader. (For Fat & Slim PSP's)
* Added IDStorage Key Backup direct from Ultimate Loader. (For Fat & Slim PSP's)
* Removed NandManager as NandTool by Cory is UPMS-Projects preferred backup/restore tool.

UPMSInstaller v4 comes with several documentation in .PDF format which should be read first before doing anything to avoid any problems.