after updating Firmware 3.11 aren’t loaded any more
it is checked on several RB751U-2HnD !!!
What’s new in 6.8 (2014-Jan-28 10:19):
*) bridge - default protocol-mode changed to RSTP for new bridges,
fixed bridge mac address changing when port (with lowest mac address) goes down
*) userman - improve startup time;
*) sstp client - support server name verification from certificate;
*) wireless - improved 11n and nv2 stability;
*) dhcp client - support interfaces in bridge;
*) dhcp - parse decimal strings and IP addreses in options value;
*) bgp - don’t show community ‘internet’ in BGP advertisements;
*) ipsec - enable hardware acceleration for aes-cbc + md5|sha1|sha256 aead on tilera cpus;
*) ospf - fixed checksum calculation for OSPFv3 AS-external-LSAs;
*) default configuration - changed dhcp server lease time to 10 minutes;
*) fixed port isolation on CRSs (bug introduced in v6.6);
*) smb - added support for SMB 2.002
*) timezone information updated;
*) ppp - fixed ppp bridging (did not work since v6.6);
*) improved speed of PPP, PPPoE, PPTP & L2TP on multicore routers;
*) address-list - fix crash when adding two identical address list entries (not allowed any more);
*) fixed multicast forwarding on CCRs;
*) firewall - improved address-type matcher, and added it for ipv6 aswell;
Somewhere, around 14h CET+1 (2 p.m.) ROS 6.8 appeared on the download site… I managed to grab the torrent… and downloaded it.
Now - 15:20 - it is gone!
Is there a problem with version 6.8…? Why did it get withdrawn?
Maybe they prepared for releasing or found a showstopper.
6.8 is available for testing yet.
Edit: http://forum.mikrotik.com/t/v6-8-pre-release-rc/73711/1
I can confirm, same hapens on Omnitik UPA.
pass version 6.7 to 6.8 in my groove and now does not start, I can not see it from Winbox, check the download page and he seems low given the 6.8 version, I mean I guess they realized the problem, I do now?
guys, please clarify, what happened? you upgraded to v6.8, then upgraded RouterBOOT to v3.11 and router is not booting anymore? Did Netinstall help?
pass version 6.7 to 6.8 in my groove and now does not start, I can not see it from Winbox, check the download page and he seems low given the 6.8 version, I mean I guess they realized the problem, I do now?
The funny thing is, 6.8 already is on the download servers. If you just replace the version numbers in the 6.7 links, the download runs nicely. 
Example: http://download2.mikrotik.com/routeros/6.8/all_packages-mipsbe-6.8.zip
Zap.
Keep in mind that until v6.8 is present at download page, then it is pre-release version and one should use it with caution.
Currently there might be issue with 3.11 RouterBOARD firmware and v6.8 (6.8rc1) version.
Wow, just downloaded. Do I want to try it? Hmm. Maybe, but where? Who should be my test subject? How bout that pesky customer that calls everyday with ridiculous problems? No, he’s nice enough. How bout the company with the IT guy that thinks he knows more than anyone? Yes, he deserves the newest software right? Maybe he can point out the bugs before I find them!
(just kidding mikrotik, I actually find your software very stable, the only real bug that’s ever effected me was that 4.2 shutdown thing, but that’s ancient history)
Will be fixed with new routerboot? 3.12?
Perhaps you should pull it so
/system package upgrade
doesn’t download it then (just verified as working on an x86 box)!
Matt.
where the heck is 6.8? 
I am also having this problem with my RB751. Tried to reset it and it worked. I reconfigured it and the same occured: during boot, it gets stuck before the wireless is on and does not get an IP via DHCP (as it is supposed to), even though the ethernet lights are on and ethernet 1 is blinking.
Yes Not booting, netinstall not works…
Actually, when trying to netinstall Omnitik-Upa ether ports not blinking and device not shows in netinstall.
BUT!!! after releasing reset button it boots normally! like after reset.
BUT!!! if you doing power on/of - again, not booting until you press reset button.
SXT goes to RMA:)
MT guys what are you smoking there???
RouterOS 6.8 seems to have been withdrawn,
but I would have withdrawn in problems such as not start as in the above?
Version 6.8 WAS available for download on the OFFICIAL download page, today - Jan. 29th, Wednesday, at around 14h (Central European Time)…
Later - @15:20 - it simply disappeared from the OFFICIAL download site!
I emphasize: It was NOT an RC1 or any other RC…!
So, my question is: Is it safe to use v6.8 that I got form the - again - official download site today?
(… but, since it has been revoked, I doubt it…! )
Looks like remote-ipv6-prefix on /ppp secret user doesn’t get added to the /ipv6 route list. This worked on 6.7 (old PPP package).
demo.mt.lv
is running the new 6.8 final may be