Here is the stock ROM for Neon Nova. Use it to unbrick your device, fix boot-loop or device freeze.
The firmware packs android 8.1.0 with the build id, SFC_NEON NOVA_V05_20190116. Make sure the device you want to flash matches that build id.
As is norm, make sure you backup your data (where applicable) before tinkering with the device.
Contained in the download resource is the device’s DA file.
NOTE: the DA file only works with SP FLASH TOOL. If your version of the tool doesn’t work with this file, try SP FLASH TOOL v5.1824.