Here it goes, performing my usual SOP for Home Center software update...
Perform a configuration backup,
Reboot HC2 (logic: flush out non-visible stuffs such as abnormalities, cache, hung processor threads, etc),
Sanity Check for 5-15 minutes (logic: reboot usually boots up fine but just in case of unforeseeable abnormal behaviour),
Proceed to firmware update,
Clear web browser cache,
Terminate web browser,
Relaunch web browser,
Repeat step 5-7 if firmware update still in progress,
Change Freeze for 1 hour (logic: allows non-visible backend scripts/processes to complete any conversions, system changes, etc that the new firmware has to perform).
https://forum.fibaro.com/index.php?/topic/23839-4110-update/#comment-106613
https://forum.fibaro.com/index.php?/topic/24475-canr-reach-the-hc2-locally-with-web-browser/#comment-115224