fisrt off the eloader would'nt be neccesary now because the games you get will run straight from the games section on the xmb(main menu).
second to get rid of SE-B you need to download the update eboot from another website, unzip it then rename i update and put it in the recovery folder that should have came with SE-B. then put the recovery folder in the games folder and run through the recovery menu. to get to the recovery menu start your psp while holding r i think.
finally i thikn you have to create the GAME271 and GAME150 folders. games for 1.5 will go in GAME150 and 2.71 games will go in the other.
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