Firmware Samsung Galaxy S2 Gt I9100 Bahasa Indonesia

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So. Two days ago, My international Galaxy SII (I9100, running 2.3.4) informed me that there was a firmware upgrade waiting for me. So, like a total dummy (dummy, dummy, dummy), I agreed to update. when it was done, I returned to my home page, only to be informed that my micro SD card has been damaged and I need to reformat it. I do know that SD cards sometime punk out, but I also know one shouldn't believe everything one reads. So, I took the card out of the phone and put it into a card reader on my PC.] (win 7) Well, waddya know. The PC can read every file just fine. So, I copied everything on that card to a folder on my PC. Then I stuck a new 16 GB card into the phone. Phone still thinks it's the same card. (I know this because there's nothing on the new card, but the phone shows me the list of apps on the original 16 GB card.) So, I'm guessing there's nothing wrong with the micro sd card. There is something wrong with that firmware upgrade. So now, I'd like to go forward or back--just get rid of this firmware version. But, not only don't I know where to look for whatever firmware version I'm now running, but I have no idea how to find a different one and replace the evil new firmware. BTW, I was running Android version 2.3.4 before the firmware upgrade and I'm still running 2.3.4 after the firmware upgrade. Yet another thing I don't understand
Before any of this came up, I had scheduled that I'd root my phone today. Don't have to have ICS--just wanted root because I want more control over my phone than unrooted gives you. Now, I don't know whether to go on and root it, or solve the SD card problem first.
Thanks!
sfrrr
model number GT-i9100
android version 2.3.4
Baseband version i9100 XXKI1
Kernel version 2.6.35.7-I9100XWKI4-CL5755468 [email protected] 143 #2
Build number GINGERBREAD.XWKI4