1.5 psp problem

hi friends
this is my first mail with lot of problems
i purchased used psp with version 2.60 .i have successfully upgraded

it to version 2.71 then downgrade it to version 1.5 using easy

downgrader.
one more thing ,i have buy a 2 gb sony memorystick duo pro.
problems---
1.when i transfer my movie files(converted by psp video 9),my psp

shows corrupted files.but some times they works.after corrupted files

msg i tried to play them in my pc through memorystick ,pc also shows

that files are corrupted now.same problem with mp3,s.
2.my psp's umd player lens is no more so i cant play umds.using

devhook 0.46 i have successfully play only one game 'puzzle bubble'

.after trying a lot of games i faced only black screen and some times

shutdown .atv offroad fury hungs after first screen.tekken iso cso says

that upgrade to version 2.6.i read topics about tekken that to play

tekken u must place any umd in umd drive there is no way to play it

using 'no umd mode '.can i play it with out umd ?
3.one more thing i store my computer data in my psp memory stick

but it has also corrupted.
4.placing 4 or five homebrews in my game folder i cant see a single

file in psp game application
.they all goes hidden no image no text but something hidden there .
plz help me
i m so tense sfter buy psp .
plz dont tell me to buy another one coz after 11 month savings i have

purchased this one.

[delement]

i think most probably is you memory stick faulty, try changing it.

[pspnegro]

If the memory stick is new, then just return it to wherever you got it from.