Hello, after a mishap with 4.2 to 4.3.0.12 upgrade I have flashed 4.2 on the phone.
The FP reader worked both with the “old” 4.2 (old incremental upgrade, not encrypted ) as well as with the freshly flashed 4.2 (encrypted).
I can’t correlate the FP failure with the encryption activation, at least not on my Xperia X.
On a 4.4 flashed on the same device (4.3.0.15 upgrade failed too) FP-related programs get an error Can't open /dev/hwbinder: No such file or directory .
For me it’s a 4.4 specific problem. I’m suspecting some driver/kernel mod failure - but without any proof.