AdvancedTomato by Jacky recommended builds for AC56U (use at your own risk):
AdvancedTomato latest builds and changelog - https://advancedtomato.com/downloads/router/rt-ac56u
Warning if upgrading from DD-WRT - http://www.polarcloud.com/tomatofaq#why_doesnt_my_password_work
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AdvancedTomato Fork by AndreDVJ builds download and changelog - http://www.snbforums.com/threads/advancedtomato-optimized-136-build-for-56u-and-68u-and-r7000.32861/
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=======2014 Builds=======
AdvancedTomato v2.4-123 changelog (based on Tomato-ARM v123)
AdvancedTomato v2.5-124 changelog (based on Tomato-ARM v124)
=======2015 Builds=======
AdvancedTomato v2.6-127 changelog (based on Tomato-ARM v127)
AdvancedTomato v2.6-128 changelog (based on Tomato-ARM v128)
AdvancedTomato v2.7-128 changelog (based on Tomato-ARM v128)
AdvancedTomato v2.8-130 changelog (based on Tomato-ARM v130)
AdvancedTomato v2.9-131 changelog (based on Tomato-ARM v131)
AdvancedTomato v3.0-132 changelog (based on Tomato-ARM v132)
=======2016 Builds=======
AdvancedTomato v3.1-132 changelog (based on Tomato-ARM v132)
AdvancedTomato v3.1-134 changelog (based on Tomato-ARM v134 MultiWAN)
AdvancedTomato v3.1-135 changelog (based on Tomato-ARM v135 MultiWAN)
AdvancedTomato v3.1-136 changelog (based on Tomato-ARM v136 MultiWAN)
AdvancedTomato v3.2-136 changelog (based on Tomato-ARM v136 MultiWAN)
AdvancedTomato v3.2-137 changelog (based on Tomato-ARM v137 MultiWAN)
AdvancedTomato v3.3-138 changelog (based on Tomato-ARM v138 MultiWAN)
AdvancedTomato v3.4-138 changelog (based on Tomato-ARM v138 MultiWAN)
=======2017 Builds=======
AdvancedTomato v3.4-140 changelog (based on Tomato-ARM v140 MultiWAN)
AdvancedTomato v3.5-140 changelog (based on Tomato-ARM v140 MultiWAN)
=======2018 Builds=======
=======Useful Links=======
AdvancedTomato site - https://advancedtomato.com/
AdvancedTomato Demo - https://advancedtomato.com/demo/#status-home.asp
Source code on GitHub - https://github.com/Jackysi/advancedtomato (old)
Commits - https://github.com/Jackysi/advancedtomato2/commits/advancedtomato-ac
Package Repo - http://tomato.groov.pl/repo/ (AdvancedTomato is based on Tomato by Shibby)
AdvancedTomato Forum Thread - http://www.linksysinfo.org/index.php?threads/advancedtomato-flat-material-designed-web-gui-shibby-base.70254/ (old)
Adblock for Tomato - http://www.linksysinfo.org/index.php?threads/script-adblock-not-so-lean.72290/