1. Download and keep the rom or kernel you want to install in your SD.
2. Back up with CWM (power off first. Then power + volume up + home button all at same time until a menu like MS-dos pops up)
3. Wipe date, wipe cache and wipe dalvik first
4. Select install and point to the right file
5. Let it run and reboot

Hope this helps!

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Added on October 4, 2012, 10:25 pm1 question: In SetCPU or VOltage Control, you have the leveler where you can adjust the voltage right? Those MV you are adjusting are for cpu arm or cpu internal?

if you are using Odin, then you need to have PC.

If you are using CWM (clockworkrecovery), then you just need to have CWM on your phone and you don't need a PC.

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Added on October 5, 2012, 10:15 pm
I think I will just do a fresh install again. Haiz I hate such problem There goes my one hour LOL!

1. Turn off phone
2. Power button + Volume Up + Home button at same time until you see a MS-dos screen up
3. Select backup first.
4. Wipe data
5. Select install from zip (and choose the Rom or kernel you earlier saved on your sd card) and it will auto flash for you.

Just make sure that you download the CWM version and not the Odin one.

System - CWM
Apps - Titanium Backup Pro
Photo, music - Saved in SD card
Photo upload - Dropbox

I'm using Sandisk Class 10 32gb ...

Quite decent

No lagging ever encountered