Older generations of MStar firmware allowed open modification and unpacking using simple command-line extraction tools. However, feature a strictly mandated SECURE_BOOT protocol.
Locate the appropriate firmware for your specific device model. It may be named update.zip or MstarUpgrade.bin . For some devices (like ViewSonic displays), after unzipping the package, you might find a file with a suffix, such as MstarUpgrade_848.bin . Rename it to MstarUpgrade.bin for simplicity. The file must be placed on a USB drive formatted as . mstarupgradebin new