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Restoring from network locations definitely works from Rescue Media, and several people have done that successfully. Also note that it doesn't matter what version of Reflect your Rescue Media uses, but rather what version of Windows PE your Rescue Media uses. Both Reflect 6 and 7 have the same WinPE version options: 3.1, 4.0, 5.0, and 10.0-1607. ALL of those support restoring from network locations, although some of them may require you to provide drivers for your network card to work. My theory for the OP's case was that the problematic V7 Rescue Media he built was using an older version of WinPE that had no driver or perhaps a less reliable driver for his network card, whereas the older V6 Rescue Media may have been built using a newer WinPE version that had better/native support for his network card, or it might have included a driver that Reflect pulled from his live Windows system to add to the Rescue Media.
However, note that for network restores, you can only use your PC's wired network adapter(s). No versions of WinPE have any support for WiFi adapters, even if you provide drivers for them.