Hello,
After getting access denied to do a GPO backup, then a system restore crashing at restart, and finally the only boot recovery option that worked was Reset, Defender reports Client 4.18.1909.6 even though it was previously Client 4.18.2011.6 before the crash. Engine: 1.1.18500.10 and the current antivirus/antimalware match for the latest version at https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-m...
My coworker has the same laptop, and when he updates, he only gets Platform: 4.18.2107.4, instead of the latest Platform: 4.18.2108.7, but engine and definitions are correct.
We are both on Windows 10 version 21H1 Build 19043.1165.
Windows Security app settings report 10.0.19041.964 for my laptop and .1024 for his.
I used DISM and SFC to correct some files after the reset with an ISO (21H1 Build 19043, but less than 1165). I also applied additional MPAM-FE from https://www.microsoft.com/en-us/wdsi/defenderupdates , but it did not repair the platform.
I tried the options at
https://www.tenforums.com/tutorials/165764-how-reset-windows-security-app-windows-10-a.html
Option 1 and then MPAM-FE.exe update did not fix the platform
Option 2 is only available in Windows 10 Insider Preview Build 20175 or higher
Option 3 - did not like &, without &, it did not like -Command
Is there another method to reset or reinstall defender?
Can the appxpackage be reinstalled from the Win10 ISO?
Thank you,
Nick
