I ended up to upgrade R620 from 5.0 to 5.1 with esxcli like this and everything seems to be ok now:
- Download VMware-ESXi-5.1.0-799733-depot.zip and copy it to a local datastore.
- Download tg3-3.124c.v50.1-841079.zip and extract tg3-3.124c.v50.1-offline_bundle-841079.zip to a local datastore. I'm not sure if this is needed because depot.zip above has tg3 already.
- Enter Maintenance mode.
- Enable SSH, log in and type:
esxcli software profile install -d /vmfs/volumes/datastore1/VMware-ESXi-5.1.0-799733-depot.zip -p ESXi-5.1.0-799733-standard --ok-to-remove
esxcli software vib update --depot=/vmfs/volumes/datastore1/tg3-3.124c.v50.1-offline_bundle-841079.zip
reboot
exit
- After rebooting exit Maintenance mode and disable SSH.
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