As you already know that the USA variants of Sony Xperia XZ and Xperia X Compact smartphones officially lack the fingerprint sensor functionality. But a thread from the XDA confirms that the absence of this feature from the USA devices is just a software limitation. That means the USA owners of these handsets can turn it on by using a simple method.
According to XDA,”after flashing the customized UK firmware from Xperifirm on the US Xperia X compact phone, the fingerprint scanner works perfectly.” That means to activate the fingerprint scanner on US based Xperia XZ and X Compact, all you have to do is to flash your handset to a different region software.You can check the below screenshots, 1st one is the US Xperia XZ with firmware customization number 1304-9026 and the 2nd one is the same US handset after the unit was flashed with UK firmware with firmware customization number 1305-2216.
Once the device is flashed to the different region, you’ll observe that the fingerprint sensor functionality is now enabled on the handset.
*Note: Remember that the flashing process may void your device’s warranty. And also you should try to flash your device to different firmware only when you know exactly how to do it manually.
To know more about how to enable the fingerprint scanning feature, follow the source link below.