Download Android Jelly Bean 4.3 stock firmware for China Mobile Zong M811 All-rounder from here or here.
Firmware details
Archive name: M811_4.3_20160904
Image: M811_SJJL_ROM_20160904A & M811_SJJL_ROM_20160904B
Archive file size: 654 MB
Support: Qualcomm Snapdragon 400 MSM8926
Build number: m811-user 4.3 JLS36C M811_01.50.00RPS release-keys
Caution: Please create non update firmware unless you lot know what you lot are doing, you lot actually desire it or it is absolutely necessary. Firmware updates may occasionally bring bad results, similar bricking your device, temporarily or permanently. The firmware update procedure is done exclusively at your ain risk. Before attempting to update the firmware, dorsum upward your data.
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