Should I Skip Recovery Installation Step From CyanogenMod ROM I have a rooted Galaxy S2 (i9100) . I've root it with CF-ROOT . Now superSU and CWM installed and there is a yellow exclamation on boot screen. When i boot my phone with VOLUME UP + HOME + POWER button, there is a screen which has title : CWM-based Recovery v5.5.0.4 .

Other details about my phone :


Model : GT-i9100
Android : 4.0.4
Baseband Version : I9100XXLQ6 
Kernel Version : 3.0.15-I9100XWLPU-CL975203 dpi@DELL167 #3 SMP PREEMT Mon Jul 30 18:18:51 KST 2012 (This is weird because i'm from Turkey and I9100XWLPU firmware not Turkey's firmware. This firmware installed to my phone at Samsung's local technical service. Here a list of Turkey's firmwares.)
Build : IMM76D.XWLPU


Now here my questions :


Should i skip Installing a custom recovery on Galaxy S II section on here : http://wiki.cyanogenmod.org/w/Install_CM_for_i9100 ? (Because i have CWM recovery mode)
I'm worried about warning on this screen : http://wiki.cyanogenmod.org/w/I9100_Info . Warning starting with Some second-generation Samsung Exynos devices are potentially susceptible to a "superbrick" ...  It is highly recommended you do not perform this operation while using a stock kernel . I know meaning of bricking but not sure about superbrick . Also i couldn't understand what they mean with stock kernel. Is this really dangerous ? Can't we (or Samsung's technical service) fix superbricked phone?
You can check whether you're susceptible by installing this app - Exynos Mem Bug Checker.

Next - installing a custom kernel isn't all that difficult and neither is it too risky if you know what you're doing.

For the S2 - Siyah kernel and Dorimanx kernel are the two most popular ones. However, the latest kernels are meant for Android 4.2.x and higher. So, use the correct version for your OS. Should you decide to install a custom ROM like CyanogenMod or Paranoid Android etc., it will install a kernel with a recovery too (as an example - Siyah and Dorimanx - which is based on Siyah - have a touch based recovery, so you can scroll through the options by touch instead of repeatedly clicking the volume buttons to scroll as in CyanogenMod or others).

The CF-Root kernel that you installed to root the S2 is a modified stock kernel, IIRC. Therefore, it might be susceptible to the Superbrick / eMMC bug.