DO NOT UPDATE!!! I just downgraded my stepson's TA-082 2.80 to 1.50 using the noobz link that several people have given you. It was a piece of cake. Follow the instructions closely and make sure you are at 100% battery with the PSP charging when you do everything.

BTW, I used my 32 mb Sony memory stick and it loaded the HEN stuff on the first try...some people have had difficulty with large memory sticks. After you finish you can upgrade to a custom OE. I personally have 3.10 OE, but there are several options. The new 3.40 OE seems to be very popular, but I am happy with mine right now.

This is a great site for getting help so don't hesitate to ask for advice. Good luck!