Previous downgraders, homebrew enablers, and other exploits were originally unable to run on the PSP Slim & Lite (which initially shipped with firmware version 3.60).[22] Initial tests found out that "Pandora's Battery" exploit was compatible with the new PSPs, however the original IPL (stored on the memory stick), based on the 1.50 kernel, did not work.[23] Eventually the M33 team was able to release custom firmware, and a revised "Pandora's Battery" that was compatible with the new PSP Slim & Lites. A "universal" PSP modifier program was released, titled "Despertar del Cementerio" (Awaken from the Cemetery). The Undiluted Platinum modchip no longer works, due to the new motherboard layout and IPL signature. The latest version of M33 custom-firmware, takes the user to 3.90 M33, but the 1.50 kernel install needs to be done manually. The PSP Slim cannot use 1.50 kernel due to its motherboard being significantly different to those of previous PSP models, however M33 developers have successfully gotten 1.50 to run on the Slim, however still very unstable. There is a new revision of the PSP Slim motherboard, dubbed TA-085 v2, as opposed to TA-085. The newer motherboard revision only seems to have taken away the ability to create a Pandora battery, because it doesn't allow for battery EEPROM flashing. No other abilities have yet been discovered. It is unclear at this time, but the new motherboard revision began shipping with either firmware 3.72 or 3.73, as opposed to 3.60 of the original slim PSP version. There is a way of determining the motherboard version from the box by the location of the serial number. This only applies to North American units. If the serial number is bottom of the box, it would be the TA-085 motherboard. If the number is on the back of the box, it may be the newer TA-085 v2 motherboard.