The LG K425 runs on Android 6.0.1 Marshmallow and its intial software release is K425v10g. As you can see in below screen shot, the K425 model rns Android 6.0.1 build MMB29M was spotted in a http user agent string too.
Accoridng to our sources, The LG K425 is the ATT LG K10.
The LG K10 LTE features a 5.3-inch In-cell display with a 720 x 1280 HD resolution, a 1.27 GHz Quad-Core Qualcomm® Snapdragon™ 210 CPU, 1.5GB of RAM and 16 GB (9.72 GB usable) of internal Storage. other specs of the LG K10 includes 8 MP Rear-Facing Autofocus Camera,5 MP Front-Facing Camera and a 2,220 mAh battery.
The LG K10 is now available from T-mobile (K428) and MetroPCS (MS428).
The LG K10 for AT&T should be available soon in June.