The original thread was:
http://www.elastix.org/component/option ... ,en/#22779
My original one-liner from that thread should work just fine, as will ramoncio's method.
I don't believe you will find the "other four" to be functional, due to the inexplicable string 'MY-NEW-MD5-PASS' in them.
/usr/bin/sqlite3 /var/www/db/acl.db "UPDATE acl_user SET md5_password = '`echo -n imanidiotandforgotmypassword|md5sum|cut -d ' ' -f 1`' WHERE name = 'admin'"