The 'OtherOS' functionality was not present in the updated PS Slim models, and the feature was subsequently removed from previous versions of the PS3 as part of the machine's firmware update version 3.21 which was released on April 1, 2010; Sony cited security concerns as the rationale. The firmware update 3.21 was mandatory for access to the PlayStation Network. The removal caused some controversy; as the update removed officially advertised features from already sold products, and gave rise to several class action lawsuits aimed at making Sony return the feature or provide compensation. COUNT 5
QSN1 What functionality did the PlayStation 3 lose in version 3.21 of its firmware update? ANS1 'OtherOS' QSN2 What reason did Sony give for taking out OtherOS? ANS2 security concerns QSN3 Was firmware update 3.21 optional or mandatory if users wanted to continue accessing the PS Network? ANS3 mandatory QSN4 Which PS3 model never included OtherOS? ANS4 PS Slim QSN5 What legal action did some disgruntled OtherOS users take against Sony? ANS5 class action lawsuits