I bought a new psp that had v3.40 already installed. I was then able to upgrade to v3.50 so I can downgraded to psp v1.5 with the lumines hack. After that I installed v3.30 oe-a and then somehow all the files inside got remove and I did not have a backup for the DATA.DXAR. I try upgrading to 3.40 oea but I could not see in xmb I did put it in the PSP/GAME150 folder. Then I try to upgrade to the official v3.50 and I had that DADADA error possible because of the motherboard. I don't have that good of a knowledge for the oe usually I used devhook with my old psp.