the game could not be started 80020148

is my sony memory stick fake - My mates stick with games works - but I can't seem to load any game ISO. I'm running a slim with 3.71 M33-4 and I've turned off UMD and tried all the various umd settings via the recovery memu. please let me know your thoughts

ISO files go in the root of your memory stick in a folder called "ISO". Just put UMD mode on "Normal- UMD required".

I needed to reformat the memory stick again and it worked fine after this.....