6.40.3 changelog:

*) dhcpv6-server - do not release address of static binding from pool after server removal;
*) export - fixed "/system routerboard" export (introduced in 6.40.1);
*) export - fixed export for PoE-OUT related settings;
*) ike1 - fixed initiator ID comparison to NAT-OA;
*) led - fixed "on" and "off" triggers when multiple LEDs are selected;
*) led - fixed RB711UA ether1 LED (introduced in v6.38rc16);
*) lte - do not show USB LTE modem under "/port" menu;
*) lte - fixed ethernet flap when LTE establishes connection;
*) lte - fixed SXT LTE graphs in QuickSet;
*) lte - improved reliability of USB LTE modems;
*) poe-out - fixed router reboot after "poe-out-status" changes;
*) rb1100ahx4 - fixed HW acceleration fragmented packet decryption when fragment is smaller than 64 bytes;
*) rb750gr3 - show warning and do not allow to use "protected-bootloader" feature if "factory-firmware" older than 3.34.4 version;
*) routerboard - added "mode-button" support for RB750Gr3 (CLI only);
*) ssh - do not execute command if it starts with "-" symbol;
*) traffic-flow - fixed reboots when IPv6 address has been set as target address without active IPv6 package;
*) userman - fixed "limitation" and "profile-limitation" update;
*) userman - fixed CoA packet processing after changes in "/tool user-manager router" configuration;
*) webfig - allow to open table entry even if table is not sorted by # (introduced in v6.40);
*) webfig - allow to unset "rate-limit" for DHCP leases;
*) winbox - added possibility to define "comment" for "/routing bgp network" entries;
*) winbox - do not show FAN related information under "/system health" menu for devices which does not have it;
*) winbox - do not show LCD menu for devices which does not have it;
*) winbox - fixed ARP table update after entry changes state to incomplete;
*) wireless - added "russia3" country settings;
*) wireless - added New Zealand regulatory domain information for P2P links;
*) wireless - updated China and New Zealand regulatory domain information;
*) www - fixed unresponsive Web services (introduced in v6.40);

Download the new 'RouterOS 6.40.3' version here: https://www.mikrotik.com/download