Download latest Android Lollipop 5.1 stock firmware for Umi Iron smartphone from here or from here. Download another Umi firmware from here.
Firmware details
Archive name: Y900_UMIIRON_V1.0_20150718_2215
Image: Y900
Archive file size: 587 MB
Project: rgk6753_65u_l1
Platform: MT6753
Config_version: V1.1.2
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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