If you experience slow speeds or "stalling" (bengong), check if a firmware update addresses these stability issues.
If bootloader is corrupted, desolder the 8-pin SPI flash chip and reprogram using a CH341A programmer with a known good full flash dump. firmware gm219-s xpon
Cyber threats evolve constantly. Newer firmware versions patch vulnerabilities that could allow unauthorized access to your network. If you experience slow speeds or "stalling" (bengong),