: Sites like Softwarezone.ga or BadCaps often host RAR or 7z files for universal boards like the SIS 231 series. Flash Instructions for SIS 231 P83

You can find the specific firmware files and board schematics on several technician-focused platforms:

smart-tech smt39dtv1 tp.sis231.pt85 v390hj1-p02 firmware dum Download free of charge (10 files / day): Elektrotanya

: The backup is usually a .bin file compressed inside a .rar or .7z archive. Use a tool like 7-Zip to extract it.

: Always read and save your current corrupted firmware before overwriting it, just in case you need to revert.

: This is one of the most reliable sources for free firmware dumps. You can find a Goldvision LED39D3F TNT dump specifically for the TP.SIS231.P83 V390HJ1 board Another variant for the Smart-Tech SMT39DTV1 uses a very similar PT85 board paired with the V390HJ1-P02 panel.

Are you experiencing a specific with your TV, such as it being stuck on the standby light or the logo? V390HJ1-P02 Overview - Panelook.com

: If you need to verify the technical specifications of your LCD cell before flashing, Panelook provides full data on the V390HJ1-P02 Chimei Innolux panel, including its 39-inch size and hard coating specs.