This process is known as and works for 99% of MS801A-based boards.
| Risk | Consequence | Prevention | |------|-------------|------------| | Power loss during write | Permanent brick (requires SPI programmer) | Use a UPS for the TV | | Wrong firmware variant | Inverted colors, sound but no video | Triple-check MAC2HG code | | Corrupted USB drive | Failed update, boot loop persists | Use a known good USB 2.0 drive | | No backup of original firmware | Can’t revert if new firmware is worse | Dump original using serial + MStar ISP tool (advanced) | 40-ms801a-mac2hg firmware
If you open your TV and see "40-MS801A-MAC2HG" silkscreened near the main processor or printed on a barcode sticker, you have identified the exact board requiring firmware. This process is known as and works for
file on a FAT32-formatted USB drive and triggering a manual upgrade through the TV's maintenance menu or a specific key combination during power-on. In-Circuit Programming In-Circuit Programming