I am a user of a 951Ui-2nD and i want to give some feedback regarding this update.
I ve bought the router few months ago as new and since i ve updated the default OS everytime a new version showed up , never paid attention to the firmware upgrade though ,untill this OS update - 6.42.1 .
I am using the device as a pppoe client to the ISP.
Default firmware was 3.36.
Prior to this update i was using 6.42.with firmware 3.36 (the factory one).With 6.42 i was having some rare timeouts (connnection was dropping) in aquiring the dynamic pppoe adress from the ISP, so i updated to 6.42.1 to see if this issue goes away and increase device security as well.
For one day the device run this update with firmware 3.36 and it looked ok , so i ve decided to upgrade the firmware as well from the winbox interface ,now it s 6.42.1 in the routerboard page .
After this the ISP drops would be 2-3 times at every 12 hours , so i wanted to roll back in some way and decided to roll back to the previous version , so i ve clicked the Downgrade button from Package list page ,nothing hapened , so again i ve decided to test the bugfix build from the package channel and i ve downgraded to 6.40.8.
Device rebooted , looked like working and i could log in via winbox ,but the router would push errors in log window ( was creating some Samba shares ?!? as per log for example) and would reboot after some minutes after each new boot , a delayed continuous loop .
As such i ve decided to go back to 6.42.1 right after a fresh reboot and i was lucky enough to do it
.Router did some automatic installation checking routine afterwards , corrected some errors and everythoing was and is now ok ,7 days with no ISP connection drop.
So maybe there is a realtion between the firmware used and OS used and /or maybe the firmware should be updated prior to the OS.
It s strange that the downgrade button did nothing.
No special issues for me with this build as a casual user
I would have a suggestion also
Maybe by default the firewall rule ""defconf: drop all from WAN not DSTNATed"" (for the INPUT chain) which by default is in the lower side of the page of the firewall, should be placed by default in the upper side of the ruleset ,after the dummy rule so the BAD traffic is dropped properly .Where it was put by default would not pick up any packets.