psp official firmwares hidden feature

[Mathieulh]

It looks like vshmain checks for the following button combination at startup :

SQUARE + TRIANGLE + SELECT + START

When this combination is issued (you need to hold the buttons before the Sony Computer Entertainment screen shows up) it will restore all the settings to default (so you will need to select the language, timezone etc etc again)

This hidden feature works from 1.00 to 3.90 so far (and probably ongoing firmwares)

I believe this must be used in service centers to deal with psps that somehow have settings issues and cannot boot otherwise (without the need to reflash them)

It is really suprising that this trick wasn't found out that far, looks like no one really looked into vshmain before.

[Neo1607]

Interesting it is surprising you guys didn't find that a long time ago

[Pirata Nervo]

hmm, this is interesting, good job

[SilverSpring]

Wow wonder why no one ever noticed that (vshmain is too big I guess to look through completely xD).

Btw, there is also a hidden button combo check in ofw IPL too.

Holding L-Trigger + either Triangle/Circle/Cross/Square.

I do not know how it affects things (I assumed devkit related).

Basically:

if (btn & PSP_CTRL_LTRIGGER)
{
    if (btn & PSP_CTRL_TRIANGLE)
        sceDdrResetDevice(3, 0);
    else if (btn & PSP_CTRL_CIRCLE)
        sceDdrResetDevice(3, 1);
    else if (btn & PSP_CTRL_CROSS)
        sceDdrResetDevice(3, 2);
    else if (btn & PSP_CTRL_SQUARE)
        sceDdrResetDevice(3, 3);
}

Havent checked from which fw they started that but it exists in the latest ones. Couldnt figure what devices it was resetting either.

EDIT: this thread might actually turn out as a documentation of all ofw hidden features, sorta like "Easter Eggs" on Video DVD's .

[mirzab14]

Originally Posted by SilverSpring

Wow wonder why no one ever noticed that (vshmain is too big I guess to look through completely xD).

Btw, there is also a hidden button combo check in ofw IPL too.

Holding L-Trigger + either Triangle/Circle/Cross/Square.

I do not know how it affects things (I assumed devkit related).

Basically:

if (btn & PSP_CTRL_LTRIGGER)
{
    if (btn & PSP_CTRL_TRIANGLE)
        sceDdrResetDevice(3, 0);
    else if (btn & PSP_CTRL_CIRCLE)
        sceDdrResetDevice(3, 1);
    else if (btn & PSP_CTRL_CROSS)
        sceDdrResetDevice(3, 2);
    else if (btn & PSP_CTRL_SQUARE)
        sceDdrResetDevice(3, 3);
}

Would it be possible to modify these to do something to our own likeing?

[AcesInThePalm]

ok this is probably a retarded question to be asking such a great PSP coder.
but have you tried purposely corrupting an idstorage key, then tried the combination.
was just thinking if it fixes the corruption in key, then this would truely be the holy grail.

[Ghostman]

I've tried the L-Trigger+ either Triangle/Circle/Cross/Square and none do anything.

BTW I installed OFW 3.80 on a slim

[arnold]

So this is basically a boot up 'Restore default settings'. WOW
That's interesting, go to someone at school and do it to their psp...

Are there other button combos? It would be extremely handy if there was a 'SONY debug' mode...hehe.

Next thing we find is 'SONY_built_in_IPL_CONFIGURATOR'.........

[jas0nuk]

Interesting stuff. I doubt the IPL one has any effect on retail units, though.

[cory1492]

Originally Posted by Ghostman

I've tried the L-Trigger+ either Triangle/Circle/Cross/Square and none do anything.

BTW I installed OFW 3.80 on a slim

It does just this, as the code above says:
sceDdrResetDevice(n, 0);
which, unless you had it hooked to debug in some fashion so you could do memory dumps, you'd probably not see it visibly do anything at all.