Download Android Jelly Bean 4.2.1 stock firmware for Lenovo A670T smartphone from here or here. Download previous firmware from here.
Firmware details
Archive: Lenovo_A670T_4.2.1 fw_20150706
Platform: Mediatek MT6589
Archive file size: 222 MB
Model: Lenovo A670T smartphone
Image: Lenovo_A670T_SDJL_ROM_20150706
Build number: lcsh89_cmcc_jb2-user 4.2.1 JOP40D 99 release-keys
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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