(2.3 MB) — Firmware specifically matched to the TP.MS1306.PB775 board.
While holding the button, plug the TV back in or power it on. Continue holding for about until the upgrade screen appears. The process takes approximately 4 minutes to complete. Official Support Channels Download FLASH DUMP TCL L40D2900 rar
Press and hold the on the TV (not the remote). Download FLASH DUMP TCL L40D2900 rar
Public archives have cataloged specific dump files for this model and its chassis (TP.MS1306.PB775): Download FLASH DUMP TCL L40D2900 rar
(2.3 MB) — Standard flash dump for the L40D2900 model.
These files are frequently hosted on technician forums and community channels such as lcd tv led tv smart tv software .
If your TV is still functional enough to access the boot sequence, you can attempt a local update: to FAT32.