Download Android Lollipop 5.1 stock firmware for Homtom HT6 smartphone from here, here or here.
Firmware details
Archive:HT6 firmware
Firmware: Android Lollipop 5.1 stock
Image: t875c-daoge-a33-33fpgu-hd-128g16g-fdd_HOMTOM-HT6-Android_5.1-R17-20160513_release
Project: hct6735m_35gu_l1
Config_version: V1.1.2
Inside archive: firmware +upgrading tool and instruction (SP_Flash_Tool_exe_windows_v5.1420.00, Driver_Auto_Installer, video instruction & Instructions for upgrade of U2.doc)
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Firmware details
Archive:HT6 firmware
Firmware: Android Lollipop 5.1 stock
Image: t875c-daoge-a33-33fpgu-hd-128g16g-fdd_HOMTOM-HT6-Android_5.1-R17-20160513_release
Model: iRULU / Homtom HT6 smartphone
Image file size: 1 GB
Platform: Mediatek MT6735M Image file size: 1 GB
Project: hct6735m_35gu_l1
Config_version: V1.1.2
Inside archive: firmware +upgrading tool and instruction (SP_Flash_Tool_exe_windows_v5.1420.00, Driver_Auto_Installer, video instruction & Instructions for upgrade of U2.doc)
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.