這次不打算升級，等以後再說吧...
What's new in 5.12 (2012-Jan-19 14:31):
*) console - allow to specify blank interval on x86 screens;
*) console - changed 'password' command, now can be used from scripts and api;
*) winbox - reorganized window layout to match console better;
*) ssh - fixed interoperability problem with psftp based clients;
*) implemented simple SMB (windows file sharing) server;
*) fixed ovpn-client - client stopped working if it was enabled/disabled at wrong time;
*) fixed ipv6 - ipv6 neighbor discovery stopped working when
interface arp setting wasn't set to enabled;
*) console - minor fixes and improvements;
*) console - added support for compact export;
*) hotspot - added login redirect through http status 302;
*) leds - added default configuration for R5SHPn wireless card;
*) ppp - fixed problem were remote-ipv6-prefix was not given to user if remote-ipv6-pool was
provided;
*) winbox, webfig - sort ethernet interfaces properly when more than 10 exist;
*) added QuickSet to RBSXT, RB411, RB711;
*) user manager - command to create and assign user profile from console;
*) added support for LTE modems (cdc ethernet type);
*) fix gre tunnels on x86 and other little endian machines;
