My friend has a TA-079 PSP with 3.03 on it and he wants to downgrade it. I read on the noobz downgrader that "Warning: After downgrading from 3.03 to 1.5, there are some remnants of 3.03 left in flash. If you later try to re-upgrade to 3.03 and repeat the downgrade, things will break. At some later point, we will work on a cleaner that will remove these extra files. Until then, enjoy! (Don't worry, upgrading to 3.03 OE firmwares still works fine)." Is there a way to make a clean flash install of 1.50? I did this on my 2.60 downgrade by downgrading to 1.00 then using my Coded Arms UMD to do an official update to 1.50. Will this work also?

Thanks.