The in-place upgrade from Bright 9.0 to 9.1 has not yet been released. We will make an announcement when it's available!
You can do what we refer to as a parallel upgrade, where you deploy a new head node,... (More)
Minimal Hardware Requirements; Supported Hardware; Head Node Installation
The problem is specific to the package developed for Dell EMC hardware. Downloading the 'generic/other' package solves the monitor timing issue and allows graphical install.