Look for "P75 2841V6 1920x1080 DREAMSAT DS40S1" on sites like Labo-IT or Firmware-All.
The extraction should result in a single file, usually named allupgrade_2841_nosig.bin or something similar. Descargar P75 2841V6 1920x1080 DREAMSAT DS40S1 part01 rar
Release the button and wait for it to reach 100%. The TV will usually restart automatically. Look for "P75 2841V6 1920x1080 DREAMSAT DS40S1" on