Hello, dear Zimbra gurus

Tried to update 8.0.2 to 8.0.3 today, and upgrade failed: I can't run Zimbra anymore, getting:
Code:
	Starting ldap...Done.
Failed.
Failed to start slapd.  Attempting debug start to determine error.
5143ac4d backend_startup_one (type=mdb, suffix=""): bi_db_open failed! (80)
Tried to check logs:
Code:
Mar 16 00:15:55 www slapd[20580]: @(#) $OpenLDAP: slapd 2.4.33 (Feb 21 2013 10:49:23) $#012#011root@zre-ubuntu12-64:/home/build/p4/zimbra/main/ThirdParty/openldap/openldap-2.4.33.4z/servers/slapd
Mar 16 00:15:55 www slapd[20580]: mdb_db_open: database "": DN index needs upgrade, run "slapindex entryDN".
Mar 16 00:15:56 www slapd[20580]: backend_startup_one (type=mdb, suffix=""): bi_db_open failed! (80)
Mar 16 00:15:56 www slapd[20580]: DIGEST-MD5 common mech free
Mar 16 00:15:56 www slapd[20580]: slapd stopped.
Tried to recover mdb:
Code:
zimbra@www:~/data/ldap/mdb/db$ db_recover -v
BDB2526 Finding last valid log LSN: file: 1 offset 28
zimbra@www:~/data/ldap/mdb/db$ ls
Does it mean that database is ok?

Tried to run suggested slapindex entryDN:
Code:
zimbra@www:~$ /opt/zimbra/openldap-2.4.33.4z/sbin/slapindex entryDN
Unrecognized database type (bdb)
5143accd /opt/zimbra/openldap-2.4.33.4z/etc/openldap/slapd.conf: line 53: <database> failed init (bdb)
slapindex: bad configuration file!
Tried to fix permission, no luck either.
Any ideas how to resolve the issue?