MacBook won't boot after installing update 10.9.2

Hi there,
After successfully installing the 10.9.2 update on my MacBook Pro, I was able to boot to the updated system once. Then, suddently my macBook crashed and I was unable to boot again.
I managed to find a way to backup my files using the recovery mode and the Disk utility, however this wasn't straightforward to me since I was using FileVault..
Does anybody else have a similar experience with the 10.9.2 update?

The login screen appears as usual, and I am able to put username/password. Then, it fails to login and it returns the user to the login screen without mouse or keyboard working.
I booted using Command Button + S (single-user mode) and I see the error
"error loading mach kernel 0xe"
At least, I am able to boot in recovery mode to backup my disk :-)

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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
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Unbeknownst to you, you had problems on your HD before the update.
Could be many things, we should start with this...
"Try Disk Utility
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http://docs.info.apple.com/article.html?artnum=106214
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An Archive & Install, which gives you a new OS, but can preserve all your files, pics, music, settings, etc...
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MacBook won't boot after installing update 10.9.2

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