[Q] Sgh I897 root/lagfix Problems

Yeah, A while back Idk I tried too root my phone I guess it was succesful Idk really...and well Idk how to lag fix it or rom it ...So I was just wondering If anyone could help me with that by giving me a explanation too see if I did do a root and how to install a rom..also For some reason I cant mount myinternal sd card it dont give me an option even when i hook it too my computer..its letting me unmount/mount my external sd card but not my internal one ..it just lets me format it.

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