get it in writing that they accept the risk that comes with not upgrading so it can’t come back on you. all you can do is CYA and make recommendations - if management does not agree with your recommendations make sure you have it documented that you informed whoever is making the decision of the risk.
if you think your employer will somehow still try to hold you accountable for this, save the aforementioned correspondence using something your employer does not manage i.e. a personal device. you could also let other people than this specific individual know about this so it isn’t just your word vs his.
this is the correct response.
get it in writing that they accept the risk that comes with not upgrading so it can’t come back on you. all you can do is CYA and make recommendations - if management does not agree with your recommendations make sure you have it documented that you informed whoever is making the decision of the risk.
if you think your employer will somehow still try to hold you accountable for this, save the aforementioned correspondence using something your employer does not manage i.e. a personal device. you could also let other people than this specific individual know about this so it isn’t just your word vs his.