Model: KOOLNEE Rainbow Smartphone
Image file size: 512 MB
Platform: Mediatek MT6580
Inside archive: firmware + SP_Flash_Tool_v5.1812 + MTK_Driver_Auto_Installer_SP_Drivers_20160804.exe
Build number: full_t939w_v2_p_djy_d27_koolnee_gms-user 8.1.0 O11019 1524909227 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.