He,

For example :i installed AppleACPIPlatform.kext in extension folder. After reboot it gives a kernel panic.
How can i uninstall this kext and replace the backed- up kext. And not have to reinstall the OSX.
I've read: after reboot press f8.
There are -v -s -x

or

boot with -s, then type
Code:

mount -uw /
rm -R /system/library/extensions/AppleACPIPlatform.kext

Can you pleace give some advice on this, thanks.

Yepp, just like that. Boot with -s, mount drive, remove kexts with rm, copy backep up kexts with cp command, repair permissions and ownership, and use reboot command. Should work again.

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Thanks, will give it a try.