Firmware info :
Device name : Huawei P9 Lite
Device model : VNS-L23
Region : Español, Mexico (AT&T)
Firmware version : VNS-L23C212B130
Firmware type : Full OTA (Image) to dload
EMUI version : v3.1
OS : Android 6.0 Marshmallow
How to flash firmware : Read Here
File name : HUAWEI_P9_Lite_Firmware_VNS-L23_Android 6.0_EMUI 4.1.1_C212B130_Mexico_AT&T.zip
File Size : 1.7 GB 
More firmware for Huawei P9 Lite VNS-L23 –> Download here