Yosemite upgrade, stuck at 50% progress bar

Some guys faced the same issue. But I couldn't restart to safe mode with shift, and recovery mode turn off wifi doesn't help to me. I tried to verify and repair the disk and permissions as Apple Care told me when I called, but not help. I also tried to use internet recovery with cmd option R and reinstall 10.9, but after reinstallation and reboot, it also stuck with some error log file, and I couldn't save this log file to my HD because I don't have permission it said.
Anyone can help me with that? I tried to use cmd S and sudo command could't be recognized in that mode. Maybe someone can help me go to safe mode without shift and let me turn off file vault (not sure whether it's on) or delete some apps.
Or any other ways to reinstall 10.9 without losing current files? I didn't back up.
Please help me.

This worked for my MBP 17" mid-2010 after 10 hours of minor panic watching progress bar stuck at 50%:
Reboot and hold SHIFT key to go into Safe Mode and keep holding that SHIFT key.
*Patience is the key to the Shift key*
Keep the Shift key down.
Do not let go of Shift key until you go to Italy when the computer does its Venetian blinds thing and goes into Safe Mode.
Check whether you have any login items. Do this via via Sys Preferences > Users & Groups
It is going to be slow. You are in SafeMode.
Remove any login apps.
Run any updates for Yosemite (e.g. Pages, Numbers, Keynote) within Safe Mode.
Reboot. 
Remember, YMMV

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    This worked for my MBP 17" mid-2010 after 10 hours of minor panic watching progress bar stuck at 50%:
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    *Patience is the key to the Shift key*
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    Reboot. 
    Remember, YMMV

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