Upgrading to V5 via sysupgrade was easy enough. But then it left me without an interface ( not to mention on the bleeding edge ), and apparently there isn't enough room in the router to install Luci.
( I may have one of the cheaper Chinese models, with only 2M of flash. )
... This was how I found out that it's quite easy to fill up all available space on the router ... an unpleasant situation that you might want to avoid, if at all possible. Fortunately, I was able to flash over it with sysupgrade again, even though I had triggered the 'no space left on the device' error.
According to the supported hardware table ( https://wiki.openwrt.org/toh/start?data … ~%5D=741nd ), v5 is supposed to be supported by r46238 ( this is seen by clicking on the device page, https://wiki.openwrt.org/toh/tp-link/tl-wr741nd ), and while there is a note at the bottom of the page saying that actual revs will vary more than what's updated in the wiki, what I actually got when I installed it was: Bleeding Edge, r49377 . That's quite a difference in revs!
And after installing it, I was still having connection issues. This time with my Nexus 5x. Switching it to always use the 2.4GHz band ( instead of automatic ) seemed to make the connection stable. ... But now I have a router that isn't stable on 5GHz.
This post ( that I'm replying to ) advocates installing a V4 image while ignoring the hardware check ... and it might do that because the hardware itself for "V5.1" reports as "TP-LINK TL-WR741ND v4" ( at least it does when querying /proc/cpuinfo.)
If you're really persistent, you might find this thread: https://forum.openwrt.org/viewtopic.php?id=47382 for installing Chaos Calmer on your 741ND .. spoiler, as of 5/8/2016, it's EOL.
( I ended up installing this one, and it appeared to work well, until I noticed that we were having issues with wireless dropping out all the time ... )
Bottom line, 741ND is nowhere in on this page:
https://wiki.openwrt.org/toh/views/toh_ … ~%5D=741nd
I might stick with r49377 for a while ( provided that there are no other issues than not being able to use 5GHz, and that I don't decide that I really want the 5GHz option ) ... at least until I can make the time to flash-back to the manufacturer's firmware.
If it were me, and I would have read this, I might have stayed with the manufacturer's firmware. ( Or at least have been more prepared to accept the consequences if I decided to install OpenWRT anyway! )
It would really be nice if a release for a UI was made for v5 of the WR741ND soon.
Oh, and this page: https://wiki.openwrt.org/doc/uci/wireless ... was really hard to follow. If you find yourself having to configure wireless via ssh, skip that page, and check out this video instead: https://youtu.be/U0Gk9TnMrFQ
In this video, he essentially uses these commands:
wifi down && sleep 4 && wifi up
.. which was much easier than trying to make sense of the wireless page.
(Last edited by cognitiaclaeves on 6 Jun 2016, 07:11)