Ensure you aren't trying to flash "Global" firmware onto a "US" locked device (or vice versa), as some wireless frequencies are region-restricted. Conclusion
Ubiquiti centralizes all software downloads to ensure users get verified, malware-free files. You should avoid third-party mirror sites and always use official channels.
The primary hub for all product lines (UniFi, UISP, AmpliFi). Download Firmware Ubiquiti
If you'd like, I can help you find a specific update if you tell me: Your (e.g., UAP-AC-Pro, EdgeRouter Lite) Your current firmware version
Read the "Known Issues" section on the Ubiquiti Community forum. Ensure you aren't trying to flash "Global" firmware
Save the firmware file to your local machine. Methods for Updating Firmware
Navigate to the official downloads section. The primary hub for all product lines (UniFi, UISP, AmpliFi)
Depending on your setup, there are three common ways to apply the downloaded firmware: 1. Automatic Update (Recommended)