Just to verify, after installing the Lenovo Energy Management v7.0.3.9, aren't you able to toggle the wireless functionality by pressing F7 or Fn+F7 (hotkey mode enabled) ?
If the above steps doesn't work, try to check the following:
1. Boot into the BIOS and ensure that the wireless functionality is enabled
2. Under Device Manager > Network Adapters, ensure that the Wireless Driver is installed and not disabled.
source : https://forums.lenovo.com/t5/Lenovo-B-and-G-Series-Notebooks/How-to-turn-WIFI-on-G40-70-Windows-7-32bit-OS/td-p/1760279
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