6.40.1 changelog:

*) bonding - improved reliability on bonding interface removal;
*) chr - fixed false warnings on upgrade reboots;
*) dhcpv6-client - do not run DHCPv6 client when IPv6 package is disabled;
*) export - fixed export for different parameters where numerical range or constant string is expected;
*) firewall - properly remove "address-list" entry after timeout ends;
*) interface - improved interface state change handling when multiple interfaces are affected at the same time;
*) lte - fixed LTE not passing any traffic while in running state;
*) ovpn-client - fixed incorrect netmask usage for pushed routes (introduced in 6.40);
*) pppoe-client - fixed incorrectly formed PADT packet;
*) rb2011 - fixed possible LCD blinking along with ethernet LED (introduced in 6.40);
*) rb922 - restored missing wireless interface on some boards;
*) torch - fixed Torch on PPP tunnels (introduced in 6.40);
*) trafficgen - fixed "lost-ratio" showing incorrect statistics after multiple sequences;
*) winbox - added "none-dynamic" and "none-static" options for "address-list-timeout" parameter under NAT, Mangle and RAW rules;

Download the new 'RouterOS 6.40.1' version here: https://www.mikrotik.com/download