(stock rom sgw) connect to kies today and kies notify that there's a new firmware update for sgw. so i went ahead and let it update. kies shows firmware upgrade in progress. the download progress bar went till around 50%, then it went back to 0% with cancel button greyed out. phone then shows in odin mode, custom binary download: no, kernel: samsung !!

there's the green android robot and the message asking not to turn off target device.

was so afraid i'd bricked the phone so i left it that way, after an hour i figure things wont progress so i disconnect the phone and took out battery (since no response from any button).

luckily phone is bootable.

should i continue to use kies update?

try restarting the phone and see, i had this problem too. if its the same as mine, after restart you'll be able to activate 3G/H/E, but after turning off packet data for a while, it cant be turned on again.