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im guessing u downloaded the KG5 stock kernel only (a 5 or 6mb file). u need to download the entire firmware file.. its a 260mb file. flash that and ur good.
Sydney99 has posted the link, in post #24. its the first link (OXA Poland), not the stock kernelcheers

Many thanks heshanj, I've done that, and my SGS2 shows XXKG5 on baseband version and Build number.
Have you found anything else, apart from the no google video chat, better battery life, that work better on this KG5 than the earlier ones? Thanks.
somethings run a bit smoother, but i cant confirm that.. and its got a new power saving mode (system power saver) and its got an option to turn off the double tap home button feature. nothing major. the battery life is the biggest one for me