This is the most common mistake users make. Sony groups drivers under the series (for example, VPCEH3B4E, VPCEH2M1E, etc.). The PCG-71911M chassis is part of the Vaio E Series (14-inch and 15-inch models from roughly 2011-2012) .
, and point it to the folder where you extracted your downloaded Sony drivers. 4. Recovery Alternative drivers sony vaio pcg 71911m drivers