I've changed my 2gb to 4gb memory stick.but the problem is ,i can't open the downloaded games on the 4gb memory stick
Iso games go in the iso folder on the root of your memory stick homebrews got to psp/game OR psp/game150
1) First of all you check that you had copied games in the same folder structure of 4gb memory card as it was in 2gb memory card. 2) If you are using the top red strip memory card as shown in image it is the reason for not opening the downloaded games on the 4gb memory card. you can try the other one type which is shown below in the image. this will work fine. Note:In image 2gb is shown as example.
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