Download latest Android Jelly Bean 4.2.2 stock firmware for Cube Talk98 U58GT tablet from here or from here. Download another Cube firmware from here.
Archive name: 0502LP01_S910_U58GTB128MXXE(STD)_E814_IND_FULL
Archive file size: 344 MB
Project: htt35_tb_jb6
Platform: Mediatek MT8135Archive file size: 344 MB
Project: htt35_tb_jb6
Config_version: V1.1.1