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Decrypt PROLiNK ADSL Modem Configuration File To Reveal Backdoor

I was recently asked by a friend to examine the settings on a PROLiNK ADSL2 router modem, model PRS1241B, to see if the performance of the modem could be improved as he was having trouble using it for video conferencing. PROLiNK is a brand of Fida International (S) Pte Ltd, a Singapore-based company founded in 1991, that produces a wide range of consumer technology products including a range of ADSL modems and routers. As usual, I wished to make a backup of the current user-configurable settings before modifying any user configurable settings. PROLiNK makes this an easy task to accomplish