Hello, I will do my best to answer the questions.
1. I got the memory stick from my friend. The stick says:
Sony, MemooryStickPRODuo, 1GB MagicGate on the front and MSX-M1GST, G628L 1L, HUBD1000000, Made in Japan on the back. It looks leget.

2. After the noobie installer is done I have three folders on the memory stick and two files at the root. Folders are KD, PSP and Registry. The files are 371.pbp and msipl.bin. Bytes used show 25,812,992 (24.6 MB) if that helps.

3. I am not sure if this PSP is bricked or just broken. My friend is not too technical and he just said it doesn't work anymore. I asked what he was doing when it quit working and he said he couldn't remember, he just said it doesn't work anymore. So he gave it to me.

The PSP makes no sound, no speakers, no UMD, no nothing. I only get a green pwr light that will stay on solid with the stock battery. And with the modified pandora battery and the stick installed I get the orange and the green lights iluminated on the left side. I assume the memory stick access light and the wifi access lights. (I am new to the PSP, that's the reason for my assumptions on the two lights on the left)

I hope the answers are helpful, Thank you.