Download and Install Stock ROM On Fly FS507 Cirrus 4 [Official Firmware]: The Fly FS507 Cirrus 4 is powered by a MediaTek MT6580A CPU. It is a very mid-range CPU. The available stock firmware is for MediaTek MT6580A Powered variant. The firmware is around 840 MB size so we recommend having a stable wifi while downloading the firmware. This […]
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