Originally Posted by emadiga
I have bought a used Samsung Note 2 and I installed Android 4.3 from SamMobile, two weeks later, I started facing a slow-response problem where the devices gets too slow to respond.
Do I have to know what is my Samsung Note 2 country of origin in order to download the right firmware?
Nope. Just make sure you download and install a ROM for your exact model, country is irrelevant though some 'other country' ROMs may have various bloatware specific to that country. So install a rooted ROM if desired, then u have control over everything.