Open SP Flash Tool and select the "Scatter-loading" button. Navigate to your firmware folder and select the text file ending in _Android_scatter.txt . Flash the Device: Power off the tablet. Click Download in the flash tool.
Do not download .exe files claiming to be "C Idea CM435 Firmware Updater." These are malware. Real firmware files come in .img (image) or .zip (OTA) formats. c idea cm435 firmware