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MSI RG54SE II
According to the OpenWrt wiki, this is a AR2317 based router with 2MB Flash and 8MB RAM. Per other sources, the FCC ID is TE7WR54XG (TP-LINK TL-WR541G) and it is shown in FCC docs as using a Micrel SPN801012 processor (Kendin KS8695?) and an Atheros single-chip solution.
Per the manual and supporting WiGLE data, the default SSID is RG54SE II.