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I connect my S2 to Samsung Keis and I cannot find any update.
My S2 show version 2.3.3, baseband version DXKI1, build number DXKI2.
How to update to 2.3.4 and where to download it?
thxs.

This is correct.
Kies will only let you download official carrier branded firmware.
If you want updates earlier, then you will have to invalidate your warranty and go intratech's Odin route
If you are checking via Kies it could be that your operator or geographic location, Indonsia, Malaysia, Phillipines, Singapore, Vietnam, have not released 2.3.4 yet.
Your other option is to update your firmware using Odin if a compatible firmware for DX (your location) 2.3.4 is available.
For more information on this, see or post here:-
Galaxy S2 - All Things Root - Android Forums
Hope this helps.![]()
Thanks for your reply, questions:-
1. Can some point to me which link is DX.
2. What is SuperOneClick v 1.91
3. What happen if I update the wrong firmware.

1. [ROM+Guide]Official i9100 Firmwares KG1/2/3/5/6/7, KH1/2/3/4, KI1/2/3/4 Download - xda-developers
(appears that 2.3.3 is the latest firmware for your region unless you change to a custom ROM)
2. Not needed for rooting these days.
Let me google that for you
3. At best, if you pick the wrong firmware, your phone may not connect... at worst, it could "brick", (render completely unusable) your handset.
Hope this helps.![]()

How to change change to a custom ROM and update to 2.3.4
Look like not an easy way, I am confuse
Thxs