You are trying to flash a file that is older than your current firmware. You may need a "downgrade" file first.
An unlock file is a piece of or a specialized flashing script designed to bypass the network restriction codes embedded in the device's software. Unlike an unlock code (which you type into a web interface), an unlock file involves "flashing" the device—replacing or patching the internal software to enable universal SIM compatibility. Why Unlock Your Device?
Unlocked hotspots generally sell for more because they aren't tied to a specific carrier.
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