Download Android 5.1 stock firmware for KingWear KW99 Smartwatch from here, here or here. Download Android 5.1 stock firmware for KingWear KW98 from here. Download Android 5.1 stock firmware for KingWear KW88 Smartwatch from here. Download Drivers & Tools and Root Pack v5 from here, here or here.
Archive name: KW99-CS1-B-20180228
Archive size: 402 MB
Image name: KW99-CS1-B-20180228
Android version: Android Lollipop 5.1 stock
Platform: Mediatek MT6580
Drivers & Tools and Root Pack details
Archive name: Drivers & Tools and Root Pack v5 04-10-16 / All Devices Core Tools and Root Pack v5 04-10-16
Archive size: 152 MB
Archive content: USB VCOM drivers, universaladbdriver_v3.0, SP_Flash_Tool_v5.16.36, QtADB, MTK Toolbox modded 64bit, MTK Toolbox 2.5.3d, UPDATE-SuperSU-v2.46.zip, NO.1 phone firmware update steps
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.