hi all,

I try out the lightroom 4 and it automatically reimport all files in my lightroom 4, but an exclamation mark was appeared at the corner and if u click it you will ask whether u want to update to current process(2012)..

instead of trying one of the image i clicked update everything and I closed the lightroom and started again, and i realise the process isn't appeared ok with my old file setting, so now I would like to restore it but the ctrl+z won't do since I have restarted the program, I still can set the file back by going back to history steps, but any way I can do it for all the files instead of doing it to thousand of files?