6.41rc6 changelog:

*) btest - improved reliability on Bandwidth Test when device`s RAM is almost full;
*) dhcpv6-client - do not run DHCPv6 client when IPv6 package is disabled;
*) ipv6 - fixed IPv6 address request from pool (introduced in 6.41rc1);
*) lte - added support for Novatel (Verizon) USB730L;
*) lte - fixed LTE not passing any traffic while in running state;
*) ppp - added support for Sierra MC7750;
*) torch - fixed Torch on PPP tunnels (introduced in 6.40);

Other changes since 6.40:

!) bridge - implemented software based vlan-aware bridges;
https://wiki.mikrotik.com/wiki/Manual:Interface/Bridge#Bridge_VLAN_Filtering
!) switch - "master-port" conversion into a bridge with hardware offload "hw" option (CLI only);
https://wiki.mikrotik.com/wiki/Manual:Switch_Chip_Features#Bridge_Hardware_Offloading
!) bridge - general development of hw-offload bridge implementation (introduced in v6.40rc36);
*) arp - fixed invalid static ARP entries after reboot on interfaces without IP address;
*) bonding - improved relialibility on bonding interface removal;
*) bridge - fixed ARP setting (introduced in v6.40rc36);
*) bridge - fixed multicast forwarding (introduced in v6.40rc36);
*) bridge - implemented dynamic entries for active MST port overrides;
*) bridge - implemented software based "igmp-snooping" (CLI only);
*) bridge - implemented software based MSTP (CLI only);
*) bridge - removed "frame-types" and "ingress-filtering" for bridge interfaces (introduced in v6.40rc36);
*) bridge - show "admin-mac" only if "auto-mac=no";
*) certificate - show "Expired" flag when initial CRL fetch fails;
*) CRS3xx - switch VLAN configuration integrated within bridge VLAN configuration with hw-offload;
*) e-mail - do not show errors when sending e-mail from script;
*) firewall - properly remove "address-list" entry after timeout ends;
*) hotspot - improved user statistics collection process;
*) interface - improved interface state change handling when multiple interfaces are affected at the same time;
*) ippool6 - try to assign desired prefix for client if prefix is not being already used;
*) lte - allow to specify the MAC address for passthrough mode;
*) rb2011 - fixed possible LCD blinking along with Ethernet LED;
*) rb922 - restored missing wireless interface on some boards;
*) sftp - added functionality which imports ".auto.rsc" file or reboots router on ".auto.npk" upload;
*) trafficgen - fixed "lost-ratio" showing incorrect statistics after multiple sequences; Download the new 'RouterOS 6.41rc6 released' over the torrent network: https://www.mikrotik.com/download/routeros-ALL-6.41rc6.torrentOtherwise please visit https://www.mikrotik.com/download/changelogs