You should check XDA The link from XDA. The reason is because Checkrom server overload and JKAY is not releasing his new version. Therefore, Gadget guy release it (consider soft release for us first).

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Added on January 22, 2012, 1:12 am

Yeah. That really sux. I was thinking just restore Jkay and SHOULD be able to work right?

current list

1) rattan - CheckROM V4
2) niregi - Turkbey
3) Shizuru - CheckROM V4
4) FallenOut - CheckROM V4
5) destEX - CheckROM V4
6) game4life - CheckROM V4
7) senbonzakura123 - Omega ROM v10
8) antt00 - Turkbey 30.3
9) snigapoe - Turkbey 30.3
10 ) xbbshampoo - CheckROM V4
11) botakbin- CheckROM V4
12) ashwin1234- Criskelo v38
13) yehlai - Cognition 777 r2
14) iori57 - Turkbey 29.5
15) Me,me and me - Criskelo v38
16) scofield - WanamLite V7.3 ICS 4.0.3 XXLP2
17) TheLaptopDudeGuy - CheckROM V4
18) Freddy Manson - CheckROM V4 HD + Siyah 2.6.2
19)Lemond - CheckRom RevoHD V4
20) ltwvince - CM 7.1 nightly
21) soulseeker6187 - CheckRom RevoHD V4
22) pikachu01 - XWKL1 stock
23) ellimist - CheckRom RevoHD V4
24) kazama- 4season 1.0
25) 1wildcat1 - Superrom v2 + superatmos 2.0
26) jacky.toh - Turkbey v31
27) Ryutaro - Batista Foxhound ROM v3.0 + Siyah 2.6.7
28) Jayro_88 - Criskelo ROM v 38
29) tenchi0205 - Batista Foxhound ROM v3.0 + Siyah 2.6.7
30) gsan - SuperROM v2.0 + Superatom kernel v2.1
31) sil3nthunt3r - CheckROM RevoHD v4 + SpeedMod K2-19

- Delay upgrade from v4 to v5 as no jkay support and some still facing battery draining issue with pre-release v5. Waiting for official instead

Some user only. Most said no issue with the battery.. 
v4 so far still stable enough for me, no need to upgrade for now.

by the way, now using SpeedMod K2-19, and for overnight idle with data on, and some auto sync, my battery just gone 4% only in 10 hours. Not bad 

on 3G..wifi off. 

I used BetterBatteryStat and these 2 apps do not present in the list. (after charged)
So this means these 2 apps do not consume battery after charged?
Hope this is real...
Thanks guys!

Btw, I noticed that BetterBatteryStat can be "force close". Do I need to do that?

That KK1 got 4 hours screen on time under heavy usage (quite a lot of surfing) and can be extended up to 5 hours under moderate usage.
btw - I haven't do any observation/test on LA2 though i found it much smoother. Like i said it's the best 2.3.6 so far. Will take some screenshot later on for you.
Below KK1 screenshot under moderate usage.

yesterday siyah 2.6.8 caused my phone to get really hot and laggy. there was no apps running and it still lags like hell even after i closed everything in services and cached. so reverted back to 2.3.5~ 2.6.7 doesnt feel good for me, and 2.6.6 has usb otg problem

Right now trying Seems smoother than 2.6.7  Battery life not yet...

You mean the KK1 under heavy usage.?  o_O

Thanks will try it out and report back

I could be wrong but have you check if the model is the same? Like the right CWM file you installed?

Are you on stock?

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Added on January 22, 2012, 6:10 pm

For me,
1. EverNote
2. SpringPad

Why can't I have the widget on my homescreen

i used to overclock my s2 to 1.8ghz
until i took an arrow to the knee
my score is 12345
next day i go buy toto
i hit jackpot
not all versions of siyah is runnin lulzactive
some version is ondemand

hey guys im having a problem here..my s2 is unable to upload photo from the phone directly to facebook..i had factory reset the phone as well..using s2(G)..

LOL am i the only 1 who is still using TW launcher and refuse to chg to other launcher? xD

fucuk, drop my phone on the fireworks just now.. lucky got casing to protect. But now casing have burn mark alrdy...

The best time on battery that I had so far since using s2 

Last time I was like you as well.. Stay using TW launcher. But after using adw launcher, i feel much smooth. Now using go launcher having. Much more function and more user friendly when come to uninstall apps. So now staying with go launcher

Siyah kernels come pre loaded with thunderbolt tweaks already, so no need for reflashing thunderbolt

I dont think siyah would override it. To be safe, just flash siyah then flash the thunderbolt tweaks