由于Lumi 在 3.4.1 版本之后关闭了漏洞利用并删除了 post_init.sh 功能。G3固件3.3.9版本以后不再支持。如果要启用 G3 的 telnet,需要将固件降级到 3.3.4 版本。降级方法如下。
1. Get 'rootfs.bin' of firmware version 3.3.4. (use 7z to extract the firmware bin)
2. Copy 'rootfs.bin' to sdcard which is using FAT32 format.
3. Power Off G3.
4. Insert the sdcard to G3.
5. Press the front button of G3.
6. Power on G3.
7. Wait three seconds and release the button.
8. If the LED is turned to RED, it starts to flash 'rootfs.bin'.