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hello ty for the reply. it happened when i rename the file, after rename that is the start nandroid says mismatch... but after changed the file name to the original file name it works after that.maybe renaming is not a good idea?It means that at least one of the files in your old backup has been corrupted.
If your data are OK in your current ROM then you can just download a new copy of the ROM you want to use and install that instead. That might be your best bet.
If you want to investigate more, Android File Verifier can tell you which file within the nandroid is bad, but that probably won't help you.
Did you do anything to the nandroid? I've heard of people having md5 mismatches after renaming the backup - never happened to me, but maybe it depends on how you do it (e.g. putting spaces in the name, or using Windows to do it). Otherwise it could just be a card error.