System/boot/oem/sbl

Hey,
my phone was upgraded to wrong region:
-I lost services.
-Can't install another firmware, getting oemsbl error.
After many things I'w tried, I'm ready to clean everything if it helps me to install update.app(original firmware)
Not sure about system and boot partitions.
I know deleting system, will delete my android system, leaving it bootable. But what about IMEI/SN? Is there something like ESF folder there?
Deleting boot, gonna leave me without boot (anyways if I won't reboot I think I can use ADB push then) but, does boot contains my bootloader info? (bootloader unlocked)
So my resources:
-Wrong region firmware installed;
-bootloader unlocked;
-Cwm/original(curent ROM) recoveries;
-update.app for my region, wich is older then that is installed in my phone right now (I can extract system.img boot.img)
-update.app the same is installed & very old nandroid backup from the oldest version of wrong region
-ADB sideload, cygwin on pc, terminal on phone etc. etc.......

& the screenshot maybe useful,
I can dd if=/dev/block//// of=mnt/sdcard2/file.img
or use adb or whatever leads to the right direction

I'm newby, but I catch quick, any info can help me:rolleyes:

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