Happened today. 
In fact, when I implement a mass update, after MONTHS the new software is available,
usually the "new defaults" are adjusted as needed in the script that I launch before or in the script that launches itself AFTER the update,
because I FIRST do some update tests to see what changes and what needs to be fixed BEFORE the update and also AFTER...
ok for now i use this script at startup
:if ([/system routerboard get current-firmware] != [/system routerboard get upgrade-firmware]) do={
:execute {/system routerboard upgrade}
:delay 60000ms
:execute {/system reboot}
}
so i have 60 seconds to mitigate bootloop.
but i prefer have routerboot updated , also is only “cosmetic”…
thank you again