How can make PDF files reflow when using PSP (paly portable station)?

Hi. We're doing projects about PSP(play portable station), we are trying to using it to read PDF files. We download "Book Reader"(free software for PSP to read PSP)to read PDF files. Due to the small screen size, it is very troublesome to read, we have to scroll all the time. We want to use the script "tagged PDF", but "Booker Reader" does not support reading tagged PDF function. How can we solve this problem? Thanks.