Stale NFS handle is ian odd thing to see on a local storage such as our optfs. As the acronym suggests, it is something affecting network drives.There have been a few reports - including yours truly - that it fixed itself after a certain time (24 hours or more). I would suggest waiting a day or two before flasing if you can afford it. However chances are stale NSFS handles are not the only FS corruption. If you do not have BackupMenu installed, flashing may still remain your only option.