Malformed beacon frames could trigger a buffer overflow in the module’s channel-state parser. Exploitation would allow an attacker within radio range to force a factory reset or, in firmware versions prior to 4.2.1a, execute arbitrary code with kernel-level privileges.
Use this method if your router is not connected to the internet or if you need to install a specific version from your manufacturer’s support page Download Firmware: Obtain the correct wltfsm-146gn firmware update
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However, I can try to provide some general guidance on how to approach a firmware update for a device: Malformed beacon frames could trigger a buffer overflow