How effective is the Pandora set?

How effective is the Pandora set?

Well I’ve tried unbricking my PSP 2006 using the pandora set but to no avail. I was pretty sure I made the set correctly. Or maybe not. Is the pandora set ONE-HUNDRED PERCENT guaranteed to for bricked PSPs due to failed updates? (I took my battery out as it shows a grey screen for quite some time). If so, what am I doing wrong? I heard that you’ll need to press some buttons to activate the pandora battery but I don’t know which. Can anyone tell me? Oh and please do tell me if the pandora set is supposed to work 100% of the time due to my case. Thanks in advance.