Use APKPure App
Get Field Test Mode (Nexus 5X/6P) old version APK for Android
Access hidden field test settings and data on your rooted Nexus 5X/6P
This app allows you to access the hidden field test settings and data on your Nexus 5X/6P.
This allows you to change settings such as enabling/disable LTE bands and viewing general information about the cellular radio on your device.
This app requires root and to be running the stock ROM