i’ve did the first firmware upgrade on my Samsung Galaxy S, using a firmware from
http://www.sammobile.com/showthread.php?t=17 it did take about 4 minutes, but having some doubts.
i did used Odin from same source to put the firmware, it’s a custom firmware works for any network,
i must say that from 2.2 where i had all things working, this firmware 2.3.5 does the same,
seems in better at signal, so far.