So 2.01 is only a security update and nothing more. V2.01 October 3rd, 2005 marked the release of the firmware V2.01, this firmware corrects the libtiff issue and thus does not allow the downgrading of the system or use of any homebrew applications. As of September 24, an exploit in libtiff has allowed people to execute unsigned code, using the Image Browser. On the same day of the release of the US 2.00 firmware, Japan also had a silent firmware update, this update was the same as the US version, it is assumed that Sony had fixed a minor bug with the semi-update. The USA release date for V2.00 was originally August 12, but it was delayed until August 24. Firmware 2.0 introduced the PSP Web Browser. Sony realized that not many people were upgrading to 1.51/1.52, so they had to give them an incentive to to update. V2.00 Japan received the next major firmware update on June 20. V1.52 June 15th marked the release of the next minor update to the firmware, it didn't promise anything new except for a security update and the ability to play UMD music. V1.51 When V1.50 was cracked, Sony quickly retaliated with a security update and V1.51 was conceived. This is the most homebrew friendly firmware. V1.50 The first firmware update for the PSP, this firmware update provided a security update, fixing the exploit that was found in the first firmware version. This firmware was quickly exploited within a few months time causing Sony to update the firmware version. Firmware Versions V1.00 When the PSP was released in Japan, all PSP units came with the very first firmware version, V1.00.
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