I use the 'Dell Support Assist'. I've just purchased a 2nd hand  Optiplex9020 and the support assist has suggested the  urgent update of system bios Version A25 dated 30/5/2019 to a release, dated 19/7/2019.

(update package for windows,  file name O902OA25.exe)

I keyed  OK, ' support assist' went thru the motions and asked for  "restart"  to complete .I keyed OK and 

ended up with a 'frozen blank screen' I had to turn of/unplugged power cord to enable a recommence.

The update did not occur , system page still shows  version A25 19/7/2019.

My question to anyone who can is,  Do I need this ?? if so , how to overcome the restart hiccup.

thank you in advance,  JohnPeak.