If that link is unavailable (as hosting changes over time), use the : The Internet Archive (Wayback Machine) hosts a mirror of the final Chinese stable build. Search for "LeEco_X722_5.9.026S_Stock_Recovery.zip" on archive.org .
Common official versions for the X722 include 20S (stable) and 26S . official letv leeco le pro 3 elite x722 stock rom link