Problem (Ongoing - please read)
Unable to boot following BIOS update from version A09 to A11  (Vostro 270)
Stop Code; Inaccessible Boot Device

Symptoms & Dialogs
“Your PC ran into a problem and it needs to restart”
Reboots - same error message
Restarts - “Preparing Auto Repair” “Diagnosing your PC” Automatic repair couldn’t repair your PC”
Defaults to Advanced Options

Selecting System Restore allows selection of several previous restore points. Choosing one of the earlier dates, System Restore will run, completes with a success notification then system restarts and successfully opens windows.

IF the system is turned off, this sequence starts all over again. I can eventually get back to the same restore point and do this all over to get up and running again but need something permanent.

Log file directs me to D:\windows\system\logfiles\srt\srttrail.txt
I do not have a D: drive but instead this file has been written in my C: drive
All other tests listed in the log file were ok.
Could there be BIOS a setting that has redirected the boot to D: instead of C: if so, where could this be checked and fixed.?
All help greatly appreciated.

System
Dell Vostro 270
12.0 gb Memory
500gb HDD
Windows Pro 10 - 1709-16299.192