Check here if your router is supported (wrt3200acm is)
https://www.dd-wrt.com/site/support/router-database
Installing and upgrading
https://www.dd-wrt.com/wiki/index.php/Installation
https://www.dd-wrt.com/phpBB2/viewtopic.php?t=310943&sid=5cfc85d3b1f6b9470ceffdb4d713bd1a
https://www.dd-wrt.com/phpBB2/viewtopic.php?p=1086369&sid=bcebf05e8b74e0e1a6b43d84b27501cf
https://www.dd-wrt.com/phpBB2/viewtopic.php?t=305228&postdays=0&postorder=asc&start=45
Firmware FAQ
https://www.dd-wrt.com/wiki/index.php/Firmware_FAQ
Download locations:
- https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2018/
- ftp://ftp.dd-wrt.com/betas/2018/
- ftp://ftp.dd-wrt.com/betas/2018/