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I bought a new Samsung galaxy S Advance(GT-i9070). It came with Gingerbread. It was actually a phone with 768 RAM-(enter link description here)I clearly verified this with the shop when I bought it. Last day I upgraded my phone to Jell bean with official Russian firmware and reset to factory default settings. But now the phone seems very slow . Also full RAM Capacity seems 521 MB at Application manager. All applications are now consuming memory from total 521 MB memory. My question is- where is remaining memory? How can I obtain the remaining memory to speed my phone? Some people on the web say to root the phone, install ROM manager etc. Are these approaches good? Please give me a solution

I bought a new Samsung galaxy S Advance(GT-i9070). It came with Gingerbread. It was actually a phone with 768 RAM. I clearly verified this with the shop when I bought it. Last day I upgraded my phone to Jell bean with official Russian firmware and reset to factory default settings. But now the phone seems very slow . Also full RAM Capacity seems 521 MB at Application manager. All applications are now consuming memory from total 521 MB memory. My question is- where is remaining memory? How can I obtain the remaining memory to speed my phone? Some people on the web say to root the phone, install ROM manager etc. Are these approaches good? Please give me a solution

I bought a new Samsung galaxy s Advance(GT-i9070)It was came with android Ginger bread.It was actually a phone with 768 RAM-(enter link description here)I clearly verified this from shop when i bought this.Last day i upgrade my phone to Jelly bean with official Russian firmware and reset to factory default settings.But now the phone seems very slow .also full RAM Capacity seems 521 MB at Application manager.All applications are now consuming memory from total 521 MB memory. My question is. Where is remaining memory? How i can obtain remaining memory to speed my phone?Some people on web says to root the phone,Install ROM manager etc.Does these approaches good?Please give me a solution

I bought a new Samsung galaxy S Advance(GT-i9070). It came with Gingerbread. It was actually a phone with 768 RAM-(enter link description here)I clearly verified this with the shop when I bought it. Last day I upgraded my phone to Jell bean with official Russian firmware and reset to factory default settings. But now the phone seems very slow . Also full RAM Capacity seems 521 MB at Application manager. All applications are now consuming memory from total 521 MB memory. My question is- where is remaining memory? How can I obtain the remaining memory to speed my phone? Some people on the web say to root the phone, install ROM manager etc. Are these approaches good? Please give me a solution