Download Android stock firmware for Yongsigaoke D1 from here or from here. Download previous firmware from here.
Archive file size: 618 MB
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.
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