If your TV is still functional, it is safer to use official update methods before attempting a manual EMMC dump flash:
The fifth part of the TCL LED43S4900 firmware is available as (67.90 MB) on Receiver Pro . This is one of five required parts for a complete EMMC dump backup of this model. Download & Extraction Download TCL LED43S4900 Firmware part05 rar
: Contact TCL Support to request the official .bin or .img update file. Copy this to the root of a FAT32-formatted USB drive, insert it into the TV, and hold the physical Power button for 10 seconds while the TV is off to trigger the update. If your TV is still functional, it is