It seems the "best" depends on your setup. I have two WRT1200AC's, both v1. My network is fairly simple compared to others, 3 wired, 3 wireless (5 if I count my printer and BR player) with an OpenVPN client.
I've ran r35531 since it's release with no issues. New releases were installed but I would revert back to r35531 when wireless or OpenVPN issues would appear.
I installed r36995 on release day with no issues but installed r37012 a day or two after release on one of my 1200's. It ran with no issues (for me) so I upgraded my other 1200v1 to r37012 and have been running it ever since on both. r37012 appears stable for my network with my config, the first since r35531 so I will keep it for now.
Having said that, r35531 or r37012 may not be stable on your router. I have shortcut forwarding engine disabled, DNSMasq for DHCP enabled with 3 static DNS IP's and Forced DNS redirection enabled to name a few but these would not cover every settings change from default.
My OpenVPN client is setup per the instructions given by the provider. The only difference from the initial install was under Additional DNSMasq Options where initially the suggestion was "dhcp-option=6, x.x.x.x, x.x.x.x , x.x.x.x" but was changed to "interface=tun1". I reverted back to the first setting as it allowed all three of my static DNS's to be tested versus only one when I used GRC's Domain Name Speed Benchmark app. (https://www.grc.com/dns/benchmark.htm)
Good luck with your install. Hope you find a release that works for your setup. My suggestion would be r37012 with the newest OpenVPN & OpenSSL versions but . . . I can't say for sure that you won't have issues. After all is said it's really a trial and error exercise.
Sorry for dust off this post, but i have a similar problem...
I tried some "betas" versions, in last r38155 of 2018-12-31.
At each flash, the router boot on the Linksys firmware, i can't boot on DD_WRT firmware.
You just need an older build, try one from March 2018, if it doesn't work try February '18 and just keep going backwards until you're on DD, once there you can upgrade to the latest from DD.
THANK YOU VERY MUCH surfguy
I flash one from March 2018 and it's works ! After, I update with one of March 2019.
Just one little problem with the WIFI. DD_wrt firmware allow everythings (and anythings). I'm not network administrator and i do anythings...
If you active "WPA Personnal" and "WPA2 Personnal", the spot dissapear.
The 2.4GHz band is OK ; but i can't connect to my 5GHz band...
Last edited by hansolo79 on Tue Jun 25, 2019 11:54; edited 1 time in total