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this post helped me greatly

When I try to power on the PSP slim with the magic memory stick inserted, the green power light comes on for a second or two, then shuts off.

The pandora battery will continue to power the PSP if I boot it up without the memory stick inserted -- it's only when the magic memory stick is in place ...

Pnoi, here's a good guide for downgrading without the use of a CFW psp phat.

http://forums.maxconsole.net/showthread.php?t=81424&page=5

I am not actually sure that you CAN downgrade a 3.71 official. You will need to do some reading, but that guide should have most everything you'll need (assuming ...

sperry, I'm not sure if a PSP slim battery can be modified using this method -- I believe they have a different motherboard.

You might need to buy a PSP "phat" battery.

Someone asked about the battery model and I'm curious to know the answer as well.

I'm opting for PSP-110...

I believe PSP-110 is what the OP used, and it is what I used. I don't think that it works with the PSP slim as a regular battery -- I think it can only operate as a service mode battery. I ...

I managed to get rid of pin 5 after some intense drunken desoldering and needle work. Thankfully I didn't short anything!

At first I was worried because the battery wasn't powering on the PSP slim when I inserted it. However, after giving it some time to charge, it does appear to immediately power ...

Can a PSP Slim power up from an unmodified 3.6v 1800mAh battery?

I broke the + contact on my battery when I was opening the case, and I have soldered it back together but I can't get the PSP slim to power on using the soon-to-be pandora battery.

Is this normal? Perhaps the PSP-1000 battery only ...