how do i turn my psp version to 1.5 from 1.0?

I got a psp thats version 1.0 for christmas and i want to upgrade it to a 1.5 but i am not sure how.

dude...... dont.....!!!!!!

ill downgrade mine to 1.5 and lets trade! 1.0 is pure gold..... very few left, worth 400+ lol

Just have a look around in the forums man.. and remember when in doubt SEARCH is your friend! :)