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I may be a little late but if you purchased your laptop after the date the firmware was released theres a chance it could harm your pc (not bad but more of a downgrade type of "update") also a chance that you could have the firmware installed already. I updated my tv with old firmware and a whole bunch of bad stuff happened, I expect it would be the same for your laptop. just wait until new updates come out and you will be safe. Best regards!

Nope. It has an APU, graphics are integrated. CPU and GPU combined. Hardly any notebook allows this, adding a discrete graphucs card. There ARE ways to do it but it'll cost the card then hardware and most of the time it isn't worth the trouble. Want to game? Get a desktop.

Laptop cpu's are usually soldered in and not upgradable.

When booting your computer press f2, it opens a bios and press > till you see the screen that has the menu open advanced, select battery life cycle extension and disable it. OR
while computer is started in windows;
http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx=152435&modelname=NP-RV515I&modelcode=NP-RV515-A03US&session_id=&from_osc=

On my during boot f2*, I go to boot priority, move with f5 when I select the USB and put it as #1, and also in the last screen (save and continue one) there should be a boot override? Could be different bios/ or the hardware on usb is not boot-able, check the files on it.