To find the original Android ROM, the most reliable sources are often niche technical forums like (Russian) or XDA Developers
If this guide saved your MXQ, consider replacing the device. The RK3128 is a decade-old architecture. A modern Amlogic S905X4 box costs $30 and runs 4x faster. However, for IPTV duty in a guest room, a properly flashed MXQ EP-68 remains surprisingly capable. Rk3128 Mxq Ep 68 Firmware