Editing PSAR

'''PSAR''' means PlayStation ARchive. It's encrypted and used to store various data, e.g. game images (PS1/PSP) or firmware files (UPDATE).

= Update PSAR =

It's possible to decrypt and unpack these PSARs using [https://github.com/John-K/pspdecrypt pspdecrypt].

== Header structure ==

{| class="wikitable"
|-
! Offset !! Type !! Description
|-
| 0x00 || char[4] || Signature, always <code>{'P', 'S', 'A', 'R'}</code>
|-
| 0x04 || uint32 || Version, known values are from 1 to 5
|-
| 0x08 || uint32 || File size without header (-16 bytes)
|-
| 0x0C || uint32 || Unknown, always 1 (may be encryption tag?)
|-
|}

== PSAR versions ==

{| class="wikitable"
|-
! Version !! Firmware !! Notes
|-
| 1 || 1.00 Bogus || Less encrypted
|-
| 2 || 1.50-1.52 || For 1.50 and later, they mangled the plaintext parts of the header
|-
| 3 || 2.00-6.61 || Latest version for normal updates
|-
| 4 || <all known> || Only used for JIG unbrick cards
|-
| 5 || 6.10-6.61 || Was found in the PSP Go updates
|-
|}