ZTE Nubia V18 (NX612J) Firmware Flash File Download [Stock Rom]
The Nubia V18 (model NX612J) is a mid-range smartphone from 2018 that was designed for endurance, featuring a large 6.01-inch screen and a massive 4000 mAh battery. This page provides an official **OTA (Over-The-Air) update package** for the device. Manually installing this update is a great way to fix bugs, improve system stability, and apply the latest security patches from the manufacturer.
Important Note: This is an OTA update package, not a full firmware for unbricking a dead phone. It must be installed on a functioning device. Your phone must also be on **100% stock, un-rooted firmware** with the original recovery for the update to install successfully.
Quick Device Specs
- Device
- Nubia V18 (NX612J)
- Release year
- 2018
- Chipset
- Qualcomm Snapdragon 625
- Display
- 6.01″ FHD+ LTPS IPS LCD (2160×1080)
- Battery
- 4000 mAh (Non-removable)
- Memory
- 4GB RAM + 64GB storage
- Camera
- 12MP rear, 8MP front
- OS
- Android 7.1 (Nougat)
Required Downloads
You only need the OTA update file itself to perform this installation. No PC or special tools are required.
Stock ROM & Firmware
| Version | Android | Region | Type | Download | Size |
|---|---|---|---|---|---|
| (General Update) | 7.1 (Nougat) | Global | OTA | Download | ~1.6 GB |
Quick Installation Guide
There are two methods to install an OTA update package.
- Via Settings Menu: Download the `.zip` file and move it to the main (root) directory of your internal storage. Go to `Settings` > `System` > `System Update`, tap the menu icon in the corner, select `Local update`, and choose the file.
- Via Stock Recovery: Download the `.zip` file and move it to your internal storage or SD card. Power off the phone, then boot into recovery mode (hold Volume Up + Power). Select `Apply update from…` and choose the `.zip` file.
For a complete, step-by-step tutorial with screenshots for both methods, please refer to our definitive guide:
How to Manually Install Official OTA Updates on Android
FAQs
Q1. Will this update fix the poor battery life on my Nubia V18?
The Snapdragon 625 is very power-efficient, so poor battery life is often a software issue. This OTA update can resolve battery drain caused by bugs or unoptimized processes. If the drain continues after the update, a factory reset or checking for misbehaving third-party apps is the next step.
Q2. Why don’t I get notifications from WhatsApp or other apps until I open them?
This is a very common issue with Nubia UI due to its aggressive background process management. This update may improve the situation. To manually fix it, go to `Settings > Battery`, find the power management or app optimization settings, and set your important messaging apps to “unrestricted” or “allow background activity.”
Q3. My phone is rooted. Why does the update fail with a “verification” error?
Official OTA updates perform a security check to ensure the system has not been modified. If root access or a custom recovery is detected, this check will fail, and the installation will be aborted. Your device must be on 100% original, untouched software.
Device-Specific Troubleshooting
- Camera Quality Seems Poor After Update: If the camera seems to perform worse after the update (e.g., slow focus, blurry images), the first step is to clear the cache and data for the Camera app. Go to `Settings > Apps > Camera > Storage` and tap “Clear Cache” and “Clear Data.” This resets the camera app’s settings without affecting your photos.
- VoLTE (Voice over LTE) Not Working: Sometimes an update can reset network configurations. If you can no longer make calls over the 4G network, go to `Settings > Network & Internet > Mobile network` and ensure the “VoLTE” or “Enhanced 4G LTE Mode” toggle is enabled. You may need to restart your phone afterward.
- Apps Closing in the Background: This is a core issue with Nubia’s software. To prevent important apps from being killed, find the “Recent Apps” screen. Some Nubia versions allow you to “lock” an app by dragging its preview down or tapping a lock icon on it. This tells the system to prioritize keeping that app in memory.
- “Verification Failed” Error During Installation: This error is definitive. It means your system has been modified (rooted, custom recovery) or you have downloaded an OTA file that is not meant for your phone’s current software version. There is no workaround except to flash a full QFIL firmware to restore the phone to a 100% stock state first.
