Playstation Update Package (PUP)
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Extraction
The PS VITA update files can be extracted using the "PS VITA Firmware xTractor".
Decryption
To decrypt the files which are unpacked using the tool, the key is available under PS Vita Keys
Structure
It is not complete but here you can see the basic structure:
Revisions
1.03
SKU Release version in Japan
1.50
Update released online together with Japanese launch