Download Android Lollipop 5.1 stock firmware for Lenovo Zuk Z1 smartphone from here or here. Download another Lenovo firmware from here.
Archive: Lenovo Zuk Z1 Android 5.1 Snapdragon 801 Firmware 160224 191240
Archive size: 596 MB
Support: Qualcomm Snapdragon 801
MBM File: prog_emmc_firehose_8974.mbn
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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