Oppo F9 and F9 Pro users are still waiting for the big Android 10 jump, but the latest stopgap news matters: a Pie-based March update is rolling out to supported devices. Reports point to new features—most notably VoWiFi (WiFi Calling) and Soloop—rather than a full OS generation change.
If you want the practical side of this update (how to get it, what to check, and what to do when VoWiFi or Soloop doesn’t appear), this guide is built to be your checklist. Treat it like a reference you can run through in 15–20 minutes.
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What this Oppo F9 & F9 Pro Pie-based March update means
A Pie-based March update typically focuses on feature add-ons, stability improvements, and carrier/region compatibility fixes. It doesn’t replace Android 10, but it can still be meaningful—especially if VoWiFi is added for better indoor calling and reduced reliance on weak cellular signal.
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Rollouts are often staged by region and device model. That means you may not see the same menu options at the same time as someone on a different carrier or country.
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What’s reportedly new: VoWiFi (WiFi Calling) and Soloop
Based on user reports tied to the March update window, two additions are the headline items.
VoWiFi (WiFi Calling): what you should expect
VoWiFi lets your phone make and receive calls over a Wi‑Fi network when cellular coverage is poor. On supported networks, it can also help with indoor calls in apartments, offices, and buildings with thick walls.
Once enabled, you may see indicators in the Dialer/Call screen or your status UI showing that calls are routed over Wi‑Fi.
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Soloop: how it typically changes usage
Soloop is commonly used for camera/video-focused experiences or “smart” enhancements depending on the build. After an update, Soloop features may be redistributed, renamed, or moved into the relevant Oppo camera or tools area.
If you don’t see it immediately, check the camera app menus and the search function inside the app—feature placement often shifts between builds.
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Prerequisites before you install the update
Before you start, make sure you’re in a clean state. Updates fail more often due to storage limits, low battery, or unstable connectivity than due to the update itself.
- Battery: keep at least 50% charge (60–80% is safer).
- Storage: free space is required for the download and installation package. Aim for at least 3–5 GB free.
- Wi‑Fi: use a stable Wi‑Fi network if the OTA package is large.
- Account stability: ensure you’re signed into the same Oppo/Google accounts you normally use—some post-update setup prompts depend on it.
- Backup: back up photos, important chats, and documents you can’t re-download.
How to check for the March update on Oppo F9 / F9 Pro
There are two practical ways to check. Start with OTA; use a computer-based approach only if OTA is stuck for weeks.
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- Open Settings.
- Tap Software Update (or About phone > Software Update, depending on your build).
- Choose Check for updates.
- If you see the March update, read the changelog text and tap Download.
If nothing appears, don’t assume your phone is incompatible. Staged rollouts can take days to weeks.
Method 2: Using a computer (when OTA is delayed)
If OTA never shows up, some users resolve the delay with official firmware tools or the update method supported by Oppo for your region. Availability varies by country and model number.
- Find your exact model number: Settings > About phone.
- Confirm your region/carrier variant (this affects which firmware package is valid).
- Use Oppo’s official firmware/update method applicable in your region (avoid third-party “full ROM” download sites).
- Follow the tool prompts exactly and never mix incompatible packages.
Step-by-step: install the update safely
OTA installs are straightforward, but the “in-between” steps are where most damage happens (power loss, interruptions, or skipping setup prompts).
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During download
- In Software Update, tap Download.
- Keep your phone on Wi‑Fi.
- When download completes, you’ll see an option to Install.
During installation
- Tap Install now.
- Leave the phone plugged in if your battery is below ~60%.
- Do not force reboot unless the installer explicitly fails and instructs you to retry.
- Your phone may restart multiple times. That’s normal for major package application.
After installation
- Wait a few minutes on first boot; background apps may re-optimize.
- Open Settings > About phone to confirm the build updated.
- Check Wi‑Fi Calling / VoWiFi menus (if your carrier supports it).
How to enable VoWiFi (WiFi Calling) if it appears after the update
VoWiFi is not purely a phone setting—carrier support is the gating factor. If your SIM/operator doesn’t provision VoWiFi, the feature may be hidden even after the update.
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- Verify your carrier offers VoWiFi and that your line is provisioned.
- Ask support if VoWiFi is enabled on your number, not just your plan.
- Check if your SIM type needs a refresh (some carriers require a remote provisioning step).
Enable it in the system menus
Menu names can vary by build, but the path is usually in calling or SIM settings. Look for one of these options:
- Wi‑Fi Calling
- VoWiFi
- WiFi preferred calling (less common)
- Open Settings.
- Go to SIM card & mobile data (or Mobile network).
- Tap your active SIM.
- Look for Wi‑Fi Calling / VoWiFi.
- Turn it On.
- If asked, agree to terms or confirm an address/emergency location (some regions require this).
Set WiFi as your preferred calling path (if available)
Some builds include preferences like “Prefer Wi‑Fi” or “Only Wi‑Fi.” If you see such a toggle, select the option that matches your carrier guidance.
For most users, keeping it on “Auto” (when available) gives the best balance between cellular and Wi‑Fi quality.
Troubleshooting: update installed but VoWiFi/Soloop is missing
Use this as a decision tree. Start with the simplest checks, because they fix the majority of “feature missing” cases.
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VoWiFi option is not showing
- Carrier not provisioned: the option may be absent if your SIM/operator hasn’t enabled it.
- Wrong region build: cross-region firmware mismatches can remove VoWiFi menus.
- Dual SIM behavior: on dual SIM setups, VoWiFi may only appear under the primary line.
- Restart needed: reboot after the first boot completes, especially if menus didn’t populate.
- Reboot the phone once.
- Confirm SIM is active and has service.
- Re-check Wi‑Fi Calling under SIM settings.
- Contact your carrier for VoWiFi provisioning.
VoWiFi shows, but calls won’t connect
- Wi‑Fi conditions: VoWiFi needs stable Wi‑Fi and correct DNS/NAT behavior.
- Firewall/VPN: enterprise Wi‑Fi, captive portals, or strict VPN profiles can block calling.
- Wrong Wi‑Fi preference: some carriers require Wi‑Fi calling to be set as allowed for roaming conditions.
- Switch to a different Wi‑Fi network (home router is best for testing).
- Temporarily disable VPN and captive portal captive sign-in screens.
- Turn VoWiFi off and back on.
- Reboot and retry a call.
Soloop features don’t work or behave oddly
- App cache: camera-related features can break after updates if caches are stale.
- Feature relocation: Soloop controls may move into a different camera mode.
- Open Settings > Apps.
- Find the relevant app (often the Camera app).
- Tap Storage > Clear cache (avoid clearing data unless you’re okay resetting preferences).
- Reopen the camera and check for Soloop in modes/settings.
Battery drain or apps misbehaving after update
After a major update, background optimization can temporarily increase battery usage. Still, you should check for repeat offenders.
- Give it 24 hours of normal use before judging battery behavior.
- Check Battery usage in Settings and identify unusually high usage apps.
- Update affected apps from the Play Store (especially dialer, messaging, and camera companions).
Common mistakes to avoid
- Installing with low battery: interruptions during system update can cause boot loops or corrupted partitions.
- Skipping reboots: if the update completes, do at least one full restart cycle.
- Using unofficial firmware packages: firmware mismatches can disable features like VoWiFi or break camera/cellular components.
- Expecting instant VoWiFi on unsupported carriers: if the SIM isn’t provisioned, the phone can’t fully enable it.
Android 10 expectations vs this Pie update
This March package is Pie-based, which means it’s a refinement release—feature additions and stability—rather than the OS-level upgrade many users want next. If you’re tracking Android 10 rollout, treat this update as progress while you wait.
When Android 10 does arrive, you’ll typically see bigger changes across UI behavior, privacy controls, and system performance. Until then, VoWiFi and Soloop improvements are the most tangible day-to-day value.
FAQs
Is the Oppo F9/F9 Pro Pie-based March update mandatory?
No, OTA updates are usually optional unless the update is required for security compliance or a critical fix. If you want VoWiFi changes, installing is the most direct path.
Will VoWiFi work on any carrier?
No. VoWiFi depends on carrier provisioning. If your operator doesn’t support WiFi calling on your line, the option may be missing or calls may fail.
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I installed the update, but Soloop is missing. What should I do?
Check the camera app for Soloop under modes or settings, then clear the camera app cache. If it still doesn’t appear, your build may not include the feature set for your region.
My phone’s performance feels worse after updating. Is that normal?
Some post-update battery drain and UI stutter can happen while apps re-optimize. Give it a day, then check battery usage and update apps from the Play Store.
What if OTA download fails?
Switch Wi‑Fi networks, ensure storage is sufficient, and retry the download in Software Update. If it keeps failing, wait a few days—staged rollouts can temporarily pause for specific regions.
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The Pie-based March update for Oppo F9 and F9 Pro is best viewed as a functional upgrade while Android 10 remains pending. The reported addition of VoWiFi (WiFi Calling) and Soloop can materially improve call reliability indoors and refresh how camera-related experiences behave.
If you want the features, focus on the basics: verify your model/region, install the OTA safely, then confirm carrier support and enable VoWiFi from the SIM calling settings. If anything’s missing, troubleshooting usually comes down to provisioning, menu placement, or cache resets—not a broken update.
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