For some Daewoo models, like the LA42L1B1LM , you’ll need a specific firmware file (in this case, dtv150_main.bin ) and a service remote control with an S9 button to manually initiate the software upgrade.
Once the upgrade begins, do not touch the remote, the buttons, or the power cord. The process typically takes 2–3 minutes. The TV will restart automatically when finished. daewoo tv firmware download