you Downloaded firmware for Huawei Y7 (2018) LDN-LX3 with build LDN-LX3C521CUSTC521D1B143 (8.0.0.143),LDN-L03C521CUSTC521D1B143 (8.0.0.143)
Huawei Y7 (2018) LDN-LX3 Published on Released 2018, April . with Android 8.0; EMUI 8.
Display size on Huawei Y7 (2018) is 5.99" and the resolution is 720x1440 pixels

You can flash The Stock firmware of LDN-LX3 using This Guide.
more about Huawei Y7 2018 LDN-LX3:

this model of huawei powerd by Octa-core 1.4 GHz Cortex-A53 and the internal storage size and ram size is 16GB storage, microSD card slot.
also it can support microSD, up to 256 GB (dedicated slot).
besides it can support Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) .
the Gpu chip model is Adreno 505 and also the Chipset model used on this model is Snapdragon 430
The camera on the Huawei LDN-LX3 comes with and support 1080p video pixles.