following up to help those that may be seeing this page recently in 2020 and it would save them some trouble in going through the thread. basically, regardless of if you use the define.js trick through ssh (i.e. symlink it to another define.js that allows for APPS) or you use the javascript way of tricking the browser, getting around the license acceptance in newer firmwares requires downgrading to version 2.21.126.
This version is available here: http://download.wdc.com/nas/My_Cloud_GLCR_2.21.126.bin
After this, you might be able to upgrade to 2.31.xx firmware and won’t be prompted again to Accept the license.
