The TSUMV29LU is a highly integrated multimedia display processor from MStar Semiconductor (now part of MediaTek). It is commonly found in:
Unsoldier the SPI flash chip (the small 8-leg chip) from the board. tsumv29lu firmware
Legal note: Modifying firmware may void any warranty and can damage hardware if panel voltages are altered. Technical Write-Up: TSUMV29LU Firmware 1
Security Considerations