How To Install Stock ROM on Verykool SL4050 Tigo (Firmware/Unbrick/Unroot)
Guide To Install Official Stock ROM On Verykool SL4050 Tigo (Back to stock, Unbrick, Unroot and Fix Bootloop): The available firmware file name is SL4050_VK_Tigo_GT_Single_SW_V1.9. The Firmware