I import a lot of .pst files and I don't want to change the user password.

What I have tried:
1. save the password (encrypted)
/opt/zimbra/openldap/bin/ldapsearch -LLL -x -D"`/opt/zimbra/bin/zmlocalconfig -s zimbra_ldap_userdn| awk '{print $3}'`" -w"`/opt/zimbra/bin/zmlocalconfig -s zimbra_ldap_password|awk '{print $3}'`" -H `/opt/zimbra/bin/zmlocalconfig ldap_url|awk '{print $3}'` "(uid=test)"
...
userPassword:: e1NTSEF9bjkxTFhsbGczUjc2MDJHYTQ5cVVOYUo1WU4xMEtSNj E=
...

2. Change the password

zmprov ma test@test.ch userPassword '123456'

3. Import the .pst files

4. Restore the base password

zmprov ma test@test.ch userPassword '{crypt}e1NTSEF9bjkxTFhsbGczUjc2MDJHYTQ5cVVOYUo1WU 4xMEtSNjE='

And only this last command doesn't work, the password is changed.
Is this possible to restore the base password for this user ?

Any help would be appreciated ;-)

Blaise