Problems flashing galaxy SCL i9003

Phone Model: Samsung Galaxy S SCL GT-i9003
Firmware / Version: 2.2.1 / I9003XXKB3
Kernel: 2.6.32.9
FROYO.XXKB3

I've tried many times to upgrade to 2.3.6, but always get WIFI "Disconnect".
The WIFI works fine in 2.2.1, but when i flash XXKPU 2.3.6, the mac changes and get WIFI Disconnect (always in Disconnect and tries to reconnect, but always keep disconnect)

Why is the mac changing every time I change the ROM?
And i dont know why in 2.2.1 get this mac address (000...1): 00:00:.....:01

I want to flash to 2.3.6 and not lose the wifi.
The XXKPU 2.3.6 i've tried is the official ROM:


EDIT
====================
I've tried once more: 2.2.1(XXKB3) to 2.3.6(XXKPU) and gets WIFI connection!!
But the mac address still 000....1, isn't that weird?

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