If you have successfully acquired the official, correct firmware file (usually ending in .bin or .rar which needs unpacking), follow these precise steps to upgrade.
: Some "free" firmware found online is "Global/Generic" (unlocked), while others are "Branded." Flashing a generic firmware over an ISP-branded one may cause your internet connection to fail if the ISP requires specific pre-configured settings.
Click and save it safely on your computer. Step 3: Upload the Firmware File Navigate to System Management > Software Upgrade .