False. Many “air-gapped” labs still use USB drives for data transfer—an infected drive carrying a maliciously crafted waveform file could exploit the RCE vulnerability when the file is previewed on the DSLG225’s display.

The DSLG225 patched firmware closes multiple high-impact vulnerabilities that could enable remote takeover and data exposure. Immediate updating, credential rotation, hardening of remote-access features, and network monitoring are essential to mitigate compromise risk and maintain secure operation.

: Released March 2022 to address various stability and security fixes. Firmware AU_1.0.6

For users on specific ISPs like TPG or iiNet, firmware is often managed by the provider. If your manual update fails, you may need to contact your ISP to see if they have a customized "locked" version of the firmware designed for their network. What Is Firmware? Types And Examples - Fortinet

Below is a structured analysis of the firmware patching history and current security status for the DSL-G225. DSL-G225 Firmware Patch History