I share a similar upgrade path with @vaskas01, in that the upgrade from v4.2 to v4.3 failed:
- old install (3.x) upgraded to 4.2, without encryption (“nemo” user): FP worked
- failed to get 4.3 running ( upgrade => bootloop)
- 4.2 flashed, with encryption (“defaultuser”): FP worked
- failed to get 4.3 running ( upgrade => bootloop)
- 4.4 flashed, with encryption: FP not working (missing /dev/hwbinder, see here)
I think @vaskas01 is on something here: the 4.4 image may miss some FP components/configs compared to 4.2. As the 4.3 upgrade failed and obliged to flash v4.4, the problem became apparent .
Or we both have phones from some defective batch, incompatible with 4.3 and preventing FP to work in 4.4. Or…