data.psar

iedoc · Post by **iedoc** » Thu Jun 09, 2005 5:36 am

what does this file do? the snes for psp doesn't have one and niether does a lot of homebrew things for psp 1.0, but the update has one, what does it do?

iedoc · Post by **iedoc** » Thu Jun 09, 2005 6:47 am

should i take it that nobody knows what this file does?

MelGibson · Post by **MelGibson** » Thu Jun 09, 2005 7:22 am

data.psp contains the program to flash the firmware

data.psar contains the files that are written to the firmware

No it is not possible to change the psar file to downgrade your psp to 1.0

iedoc · Post by **iedoc** » Thu Jun 09, 2005 7:40 am

ok thanks, i wasn't thinking about downgrading my firmware, but why cant you? and also, if your going to run an emulator or something, then you wouldn't need data.psar right?

pdc · Post by **pdc** » Thu Jun 09, 2005 10:10 am

iedoc wrote:ok thanks, i wasn't thinking about downgrading my firmware, but why cant you? and also, if your going to run an emulator or something, then you wouldn't need data.psar right?

What's the URL for the PSP-Wiki again...?

iedoc wrote:ok thanks, i wasn't thinking about downgrading my firmware, but why cant you?

1. DATA.PSAR is encrypted.
2. DATA.PSAR is of unknown format.
3. DATA.PSAR has an internal checksum.
4. The Updater/Flasher application does integrity checking on the PSAR and/or its contents. (?)

I expect this also covers why developers aren't using PSAR files...