How to Fix Sub-GHz Issues After a Firmware Update (2026 Edition)
Sub-GHz scanning is one of the most used features of the Flipper Zero, but it’s also the feature most affected whenever a new firmware update is released. In 2026, firmware changes introduced stricter safety filters, new frequency handling rules, and improved decoding routines. While these updates improve stability, they can sometimes cause Sub-GHz scanning or detection to stop working correctly until the device is reconfigured.
This guide covers the most common Sub-GHz problems that appear after a firmware update—and how to fix them quickly.
Why Sub-GHz Issues Happen After Updating
Sub-GHz performance can change for several reasons:
The firmware resets your region settings
Your frequency database updates and filters certain bands
Your saved Sub-GHz files become outdated
Your device enters power-saving mode
The update changes antenna calibration
Signal detection sensitivity is temporarily reduced
Your remote or sensor uses a frequency not supported in your region
These issues are normal and can be fixed with simple steps.
Step 1: Re-Check Your Region Settings
After a firmware update, the Flipper Zero may revert to default region rules. Some frequencies used by your remotes or sensors may be restricted until you re-apply the correct region.
To check your region settings:
Open Sub-GHz
Select Settings
Check your region (EU, UK, US, AU)
Reapply the correct region if needed
This immediately restores access to region-approved frequencies.
Step 2: Reboot the Flipper Zero to Recalibrate the Radio
Many Sub-GHz issues resolve after a full restart because the radio module resets after firmware updates.
Power off the device
Wait 10 seconds
Power it back on
Retest Sub-GHz scanning
This recalibrates the internal RF module to the new firmware.
Step 3: Ensure You Are Using the Correct Scan Mode
Sub-GHz now has more scanning options in 2026:
Live frequency monitoring
Remote key scanning
Sensor detection mode
Raw capture mode
If you are in the wrong mode, the Flipper will appear to detect nothing.
Switch between modes and retest your device.
Step 4: Disable Power-Saving Mode
The 2026 update introduces a more aggressive power-saving mode that reduces radio sensitivity.
To disable:
Open Settings
Select Power
Turn off Power Saving
Retry scanning—this alone fixes detection issues for many users.
Step 5: Check Your Remote’s Battery and Distance
Remotes often fail to register after updates simply because the Flipper is more selective about signal strength.
Make sure:
You use a fresh remote battery
You scan from 5–20 cm away (not pressed against the Flipper)
You point the remote directly at the Flipper
Sub-GHz scanning is extremely sensitive to distance after the 2026 update.
Step 6: Reinstall Sub-GHz Frequency Databases
Sometimes the firmware update causes frequency files or decoder scripts to mismatch.
Open the Mobile App
Go to App Hub
Search “Sub-GHz Tools”
Reinstall the pack
Sync back to the Flipper
This restores the latest frequency definitions.
Step 7: Check If Your Device Uses Rolling Code or Encryption
The 2026 firmware improved encryption detection. If your remote uses:
Rolling codes
Challenge-response
Encrypted packets
The Flipper Zero will show activity but not decode the signal. This is expected and indicates the device is secure.
If the Flipper displays “rolling code detected” or “encrypted burst,” the device is functioning correctly.
Step 8: Try an Earlier Stable Firmware
If the update caused a major regression:
Open Mobile App
Go to Firmware
Select Older Versions
Install the previous stable build
Reboot and retest.
Many users report this restores normal Sub-GHz behaviour.
Step 9: Inspect the RF Antenna for Damage
If you recently updated and the device fell, got compressed, or was exposed to moisture, the RF antenna may be affected.
If you notice:
Weak detection
No activity at all
Inconsistent readings
Short detection range
Hardware inspection may be needed. This is rare but possible.
Step 10: Reset Sub-GHz Settings to Default
If everything else fails:
Open Sub-GHz
Select Settings
Tap Reset to Default
Restart your Flipper
This clears corrupted settings caused by firmware migration.
Final Thoughts
Sub-GHz performance in 2026 is more powerful and secure than ever, but firmware updates can temporarily disrupt behaviour until the device is recalibrated and reconfigured. Following the steps above will resolve nearly all post-update issues and restore normal detection and scanning performance.
