Warning: Do not turn off the power or remove the USB until the process reaches 100% and the device reboots.
Have you successfully updated your MST999 H2 Mini 4? Share your experience in the comments below, and feel free to link to any verified firmware sources (no spam, please). For more guides on projector maintenance and Android TV tips, subscribe to our newsletter. qmax mst999 h2 mini 4 software update free