![]() ![]() If successful, the command will output the following message:īesides rolling back Defender’s engine to the previous. ( as described in Microsoft’s KB4052623 support article) 4 version by typing, from an administrative prompt, the following command: "%ProgramData%\Microsoft\Windows Defender\Platform\.4-0\MpCmdRun.exe" -revertplatform That means you may roll back Defender’s engine to the previous. On Windows 10, Defender usually keeps a copy of the previous engine(s) at the %ProgramData%\Microsoft\Windows Defender\Platformįolder. 4 version only made no difference.Īdditional help (KB) for future reference ( in case anyone’s interested): Trying to roll the engine back to the previous. 7 engine: scans were OK right after the engine upgrade, but they got broken afterwards, somewhere along by subsequently released definitions. The latest definitions (v 1.301.1684.0, signed 22:38 ) seem, indeed, to have fixed the bug ( Quick and Full scan appear to be working fine again), which was not introduced solely by the latest.
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