6.40.2 changelog:

*) dhcpv6-client - fixed IA evaluation order;
*) led - fixed "modem-signal" LEDs (introduced in 6.40);
*) pppoe-client - fixed wrong MRU detection over VLAN interfaces;
*) rb2011 - fixed possible LCD blinking along with ethernet LED (introduced in 6.40);
*) sfp - fixed invalid temperature readings when ambient temperature is below 0C;
*) winbox - added certificate settings;
*) winbox - added support for certificate CRL list;
*) winbox - do not show LCD menu for devices which does not have it;
*) winbox - hide "level" and "tunnel" parameters for IPSec policy templates;
*) winbox - hide FAN speed if it is 0RPM;

Download the new 'RouterOS 6.40.2' version here: https://www.mikrotik.com/download