[Q] Difference between root and cf-root? And revert to stock versions? - Galaxy S II Q&A, Help & Troubleshooting

Hello,
(1) I am confused between root and cf-root? What's the difference between them?
I'm talking about these threads.
http://forum.xda-developers.com/showthread.php?t=1056334
http://forum.xda-developers.com/showthread.php?t=1103399
(2)CF-root - "THIS IS NOT A ROM - it is only a modified kernel.". Will rooting (either root or cf-root) change my kernel version?
(3)Let say I installed/ flashed/ root/ cf-root (i don't know which is the right word) my SGS 2 phone, can I get back to my stock version including kernel version for warranty purpose? Using these steps to revert to stock (http://forum.xda-developers.com/showthread.php?t=1075278), right?

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As far as I gleamed, you have to have the correct version of the rom installed before you root. So if you want to root with CF-Roots KE7 kernel package, you have to first install a KE7 Rom.
To get back to your stock version you have to get a hold of the correct carrier branded rom and flash it with Odin. Take a look here.
By the way, you can find out wich version you currently have by entering *#1234# in your dialer.
Anybody more knowledgable feel free to correct me.

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brook51 said:
Hello,
(1) I am confused between root and cf-root? What's the difference between them?
I'm talking about these threads.
http://forum.xda-developers.com/showthread.php?t=1056334
EXTINCT METHOD Chain Fires original ROOT no longer used
http://forum.xda-developers.com/showthread.php?t=1103399
Current method of rooting Chainfires latest
(2)CF-root - "THIS IS NOT A ROM - it is only a modified kernel.". Will rooting (either root or cf-root) change my kernel version?
Yes if you have kernel KE2 and flash CF Root KE7 its now KE7
(3)Let say I installed/ flashed/ root/ cf-root (i don't know which is the right word) my SGS 2 phone
Its root all the same do you need root ???
, can I get back to my stock version including kernel version for warranty purpose?
If you have a copy of your original branded firmware flashing that back and removing apps that require root and resetting custom binary rom counter to 0 should be enough . Or flash a stock Samsung firmware
Using these steps to revert to stock (http://forum.xda-developers.com/showthread.php?t=1075278), right?
Click to expand...
Click to collapse
Yes that's the basics .
jje

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I rooted my SGSII using CF-Root 3.7, re-flash stock do zImage in CWM etc to remove the warning
Now there is CF-Root 3.8 available. Is it important to update? Do I need to repeat the same cycle:
- ODIN flash cf-root
- CWM kernel flash of .zip file
- ODIN flash stock kernel
- CWM kernel flash of zImage
TIA

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rosely1971 said:
I rooted my SGSII using CF-Root 3.7, re-flash stock do zImage in CWM etc to remove the warning
Now there is CF-Root 3.8 available. Is it important to update? Do I need to repeat the same cycle:
- ODIN flash cf-root
- CWM kernel flash of .zip file
- ODIN flash stock kernel
- CWM kernel flash of zImage
No need to update and yes the same method .
jje
Click to expand...
Click to collapse

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flaake said:
To get back to your stock version you have to get a hold of the correct carrier branded rom and flash it with Odin. Take a look here.
Click to expand...
Click to collapse
I do not think that all stock kernels and their CSC and MODEMs are available or even noted. I flashed a custom ROM and would like to get back to the unbranded Netherlands version (likely the same KE2 for Benelux) but its unlisted even on samfirmware.com
I should think that flashing any stock version for your region (EU/USA/ROW) would leave the warranty intact in so far as a Samsung repair centre won't care/tell the difference.