can not restore CWM backups.....

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http://forum.xda-developers.com – i just received a replacement Nexus 7 from Google. After unlocking and rooting I am unable to restore any backup that came from my previous Nexuz 7. I keep MD5 errors.I copied the files from old Nexus to my computer then to the new one. After this no good. Advice please. (HowTos)