Here I have shared firmware(flash file / Rom) for HUAWEI Y520-U12, which is available to free download using unofficial link shared below. The version of this flash file for HUAWEI Y520-U12 is 4.4.2. In case If you were already looking to download HUAWEI Y520-U12 firmwware/flashfile then this page might be helpful to you. To start download 4.4.2 flash file for HUAWEI Y520-U12 click given link at the end of this post.
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Below is this working to downloading link for the firmware/flash file of HUAWEI Y520-U12. To start download click link below and wait for 3 to 5 seconds and your download will automatically start. Download here