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all configuration I do it in my labs lost after upgrading to v.2.0.3.77 .
all devices don't have any configuration in NVRAM .
what can I do to recover it , I implement my graduation project in the EVE and I don't have a backup for this configuration.
any help please.

check if files under /opt/unetlab/tmp still exists

EVE-NG update don't delete those files....

If yes you should have all labs intact.

If not, use exported config ...

If you didn't export your config, all is lost....