PC Show? Trade in maybe, but no such thing as upgrade unless you
buy a brand new one.
And er... stickers are already present. This is to show that nobody
has tampered with it, but if you know people.... nothing is
impossible.
Some posts are ridiculous enough, like mine, but can't care so
much. It's better to be on the safe side. Some people can be like
Bao Gong, tie mian wu shi.
haha no lah,that time went to dont know comex or some it show acer
giving free upgrade ram.. saw them on the spot open your laptop and
slot in another
ram.so wondering what if they give lame excuse that you broke the
seal on your own 
(then no shi baibai void warranty by them)
anyone kena before? o.O
