Vintage phone s312 cant charge (Unknown charger)

Hi all
I hope an expert see this, and can help getting my vintage SONY-ERICSSON s312 back to 'life'.
I have lost the orr. charger ..stepped on it :|. So i charge in my computer, with the shipped USB-charge cable.
This works fine, but only if the phone can be set to either pict-brigde, or camera-album.
But something went wrong. It was placed for charging, but did not. instead it used all power, and the display turned red!
I have had this happen once before, but it is years ago. There is a KEY-COMBO that has to be made, and the battery has to be out, afai remember..
It is this KEY-COMBO is hope someone knows!
It is NOT the factory-reset combo, it is a special "charger-recover" combo. TYIA!

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