Xiaomi No Signal After HyperOS Update in Bath

Xiaomi No Signal After HyperOS Update? 9 Working Fixes (2026)

If your Xiaomi, Redmi or POCO phone lost mobile network signal immediately after a HyperOS update, you're not alone. This is often a software compatibility issue rather than a hardware fault. This UK guide covers the most common fixes for EE, O2, Vodafone, Three and other UK networks.

Works For

  • ✔ Xiaomi 12 / 13 / 14 / 15 series
  • ✔ Redmi Note 12 / 13 / 14 series
  • ✔ POCO F / X series
  • ✔ HyperOS 1.x / 2.x
  • ✔ MIUI 12.5+

Note: Menu names may vary slightly depending on your HyperOS version and region.

No Signal After Update? Quick Fix

  • ✔ Toggle Airplane Mode – Turn on for 30 seconds, then off. This resets the cellular modem.
  • ✔ Restart your phone – Solves most transient signal issues.
  • ✔ Re-seat the SIM card – Power off, remove the SIM tray, clean contacts, and reinsert.
  • ✔ Select network manually – Settings → SIM cards & mobile networks → Preferred network type → Try 4G/3G.
  • ✔ Reset network settings – Settings → Connection & sharing → Reset Wi-Fi, mobile & Bluetooth.
  • ✔ Check for another update – Xiaomi often releases patches for signal issues.

Quick Answer

If your Xiaomi lost signal after a HyperOS update, the most common cause is a software compatibility issue with the new modem firmware. Start by toggling Airplane Mode on and off, restarting your phone, and re-seating your SIM card. If that doesn't work, try manually selecting your network or resetting network settings. Signal-related issues have been reported on certain Xiaomi devices, with fixes released in later HyperOS updates.

Check Your Carrier Status Before Troubleshooting

Before spending time on phone-side fixes, check whether EE, O2, Vodafone, Three or your MVNO are reporting an outage in your area. You can check:

  • EE – Check the EE status page or call 150
  • O2 – Check the O2 network status page or call 202
  • Vodafone – Check the Vodafone network status page or call 191
  • Three – Check the Three status page or call 333

Why Signal Drops After HyperOS Updates

Understanding why this happens helps you fix it correctly:

Phone-Related Causes

  • Modem firmware compatibility – HyperOS updates sometimes include new modem firmware that may temporarily affect modem behaviour until a later software patch.
  • Network settings reset – Major updates can reset network configurations, causing the phone to lose connection to your carrier.
  • SIM slot conflict – Some users have reported signal loss on specific SIM slots after updating to HyperOS, particularly on devices like the Xiaomi 12X.
  • Corrupted network profiles – The update may leave corrupted network data that prevents proper registration.

Carrier-Related Causes

  • Carrier configuration changes – Updates may change how your phone communicates with UK carriers like EE, O2, Vodafone, and Three.
  • Network provisioning – In rare cases, your carrier may need to re-provision your SIM after a major system update.

Check Baseband and IMEI First

Before troubleshooting further, check these critical items:

Check Baseband Version

After a HyperOS update, the baseband (modem firmware) can sometimes show as Unknown. If this happens, no amount of settings changes will restore signal.

  1. Open Settings
  2. Tap About phone
  3. Tap Detailed information or Status
  4. Look for Baseband version
  5. If it shows "Unknown" – software repair is usually required. Reinstall the latest official firmware if available.

Check IMEI Status

If IMEI shows as Unknown or 0, the phone cannot register on any network.

  1. Open the Phone app
  2. Dial *#06#
  3. Check that both IMEI numbers appear correctly
  4. If IMEI is missing – this indicates modem firmware or software corruption, often requiring firmware repair.

Important: If your Baseband or IMEI shows as Unknown, proceed directly to "Check for Another HyperOS Update" or contact Xiaomi UK Support. The fixes below may not help.

Known HyperOS Signal Issues

Signal-related issues have been reported on certain Xiaomi devices, with fixes released in later HyperOS updates. Examples include:

  • POCO M4 5G – No signal, No SIM Card detected on V816.0.2.0.ULSINXM. Fix available in V816.0.3.0.ULSINXM.
  • Xiaomi 12X – No signal on SIM 2 after HyperOS 1.0.10 update. Some users have reverted to version 1.09 as a workaround.
  • Xiaomi 15 – Some UK users with CN devices on Global ROM have reported update-related issues.

Check if your device is affected: Go to Settings → About phone and note your HyperOS version. If your device and build match any of the above, check for OTA updates regularly.

Step-by-Step Fixes

Step 1: Toggle Airplane Mode

Turning Airplane Mode on and off resets the cellular modem and often resolves temporary signal issues.

  • Swipe down the notification panel
  • Tap the Airplane Mode icon to turn it ON
  • Wait 30 seconds
  • Tap the Airplane Mode icon to turn it OFF
  • Check if signal returns

Step 2: Restart Your Phone

A restart can clear temporary software glitches that cause signal loss after an update.

  • Restart your Xiaomi phone
  • After reboot, check if signal returns

Step 3: Re-seat Your SIM Card

Physical SIM issues can sometimes cause signal loss, especially if the update triggered a re-detection.

  • Power off your phone
  • Remove the SIM tray
  • Clean the SIM contacts with a dry cloth
  • Reinsert the SIM firmly
  • Power on and test

Step 4: Select Network Manually

Manually selecting your network can force your phone to re-register with your carrier.

  1. Settings → SIM cards & mobile networks
  2. Tap your carrier's SIM
  3. Tap Preferred network type
  4. Try switching between 5G, 4G (LTE), and 3G to see if a lower band picks up signal better in your area
  5. If you see a network, tap it to register

Step 5: Reset Network Settings

This resets Wi-Fi, mobile data, and Bluetooth settings without deleting your personal data.

  1. Settings → Connection & sharing
  2. Select Reset Wi-Fi, mobile & Bluetooth or Reset network settings
  3. Confirm the reset
  4. Restart your phone
  5. Check if signal returns

Step 6: Check for Another HyperOS Update

Xiaomi regularly releases patches for signal issues.

  1. Settings → About phone → Check for updates
  2. Install any available updates
  3. Restart your phone and test

Step 7: Test Your SIM in Another Phone

This helps identify if the issue is your phone or your carrier.

  • Insert your SIM into another phone
  • If it works, the issue is with your Xiaomi device
  • If it doesn't work, the issue is with your carrier or SIM

When to Contact Your Carrier or Xiaomi UK Support

Contact your UK carrier if:

  • The SIM works in another phone but not yours
  • You're getting authentication errors when trying to connect
  • There's a known network issue in your area

Contact Xiaomi UK Support if:

  • You've tried all steps above and still have no signal
  • You've tested your SIM in another phone and it works
  • The issue persists across multiple SIM cards
  • You suspect a hardware fault with the cellular antenna or modem chip
  • Baseband or IMEI shows as Unknown

Contact Xiaomi UK Support

If signal still doesn't return after completing all steps, contact Xiaomi UK Support:

  • Xiaomi UK Support website – Official support portal for UK customers
  • Feedback app – Settings → Services & feedback
  • Xiaomi Community – Post in official Xiaomi community forums, including UK-specific threads

Final Verdict

If your Xiaomi lost signal after a HyperOS update, the most common cause is a software compatibility issue with the new modem firmware. Start by toggling Airplane Mode on and off, restarting your phone, and re-seating your SIM card. If that doesn't work, try manually selecting your network and resetting network settings. Check for another HyperOS update, as Xiaomi regularly releases patches for signal issues. If the problem persists, test your SIM in another phone and contact your UK carrier or Xiaomi UK Support.

Quick summary:

  • No signal immediately after update → Toggle Airplane Mode; restart; re-seat SIM
  • Signal only on one SIM slot → Try different SIM slot; reset network settings
  • Signal but can't register → Select network manually
  • Known affected device → Check for OTA update
  • Baseband or IMEI Unknown → Contact Xiaomi UK Support

Frequently Asked Questions

Why did my Xiaomi lose signal after HyperOS update?

This is often caused by modem firmware incompatibility or network settings being reset during the update. Signal-related issues have been reported on certain Xiaomi devices, with fixes released in later HyperOS updates.

How do I restore signal on Xiaomi after update?

Toggle Airplane Mode, restart your phone, and re-seat your SIM card. If that doesn't work, try manually selecting your network or resetting network settings. Check for another HyperOS update as well.

Can a HyperOS update cause signal problems?

Some HyperOS builds have caused signal issues on certain devices. Signal-related issues have been reported on devices like the POCO M4 5G, with fixes being released in later updates.

What if my Baseband or IMEI is Unknown?

If Baseband or IMEI shows as Unknown, this indicates modem firmware or software corruption. Try reinstalling the latest official firmware if available. If that doesn't help, contact Xiaomi UK Support.

How do I reset network settings on Xiaomi HyperOS?

Go to Settings → Connection & sharing → Reset Wi-Fi, mobile & Bluetooth (or Reset network settings). This clears all saved Wi-Fi and Bluetooth connections but doesn't delete personal data.

Do these fixes work on UK Xiaomi devices?

Yes. This guide applies to Xiaomi, Redmi, and POCO devices sold in the UK. The steps are identical across UK models.

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