Im on FW RUT9XX_R_00.04.233 planning on upgrading to newest available FW..
(A month ago the WebGUI found new FW but now I get a "No update available", but that's alright as I'll just download it and do it manually).
However, I want to be prepared for if I have to reconfigure the whole device again after the FW-upgrade...
Last couple times I set this device up, back in mars-april 2018, I had to reconfigure it with every new fw-release I decided to try, and those were frequent back then.
But now I noticed the "Keep all settings" field, don't remember If that was available back then or if it simply didn't work as intended..