Are you trying to fix a like slow Wi-Fi or OLT connection errors? Are you using it with a specific provider ?
: For ISPs, the latest firmware provides better support for the TR-069 protocol, allowing for seamless remote management, automated configuration, and bulk firmware pushes without requiring a technician to visit the home. The Challenges of Firmware Updates
Many "new" versions are specifically flashed with English firmware to make them more accessible for international B2B procurement and ease of configuration. 3. Best Practices for Firmware Management