Help!! Installed Aftermarket stereo and Nav wont work?!

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Hi all, im new to this forum and am a proud new lexus is200 owner. I recently decided to remove the factory stereo and install an aftermarket double din stereo, upon completing the installation i noticed the satnav screen is gone blank and will just go crazy whenever the ignition is turned over the screen just flips up and down. I searched the internet for a solution and came across one post which was a guy selling a device on ebay what tricks the car into thinking the factory stereo is still there however he has no longer got any devices left and doesnt sell them. Does anyone know any other way to get it working again? Any help will be highly appreciated. Thanks

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