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When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio. The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your Rover service centre and get them to enter this code for you.
Need to reenter the radio code, it's normally located in the glove box or behind the radio itself, once found you should have about 3 tries to enter the code, if more attempts are needed, disconnect the neg battery cable for 5 minutes and retry.
Any time battery is disconnected the radio has to have a code reentered. This is a theft prevention issue. You should have gotten the code if you bought the car new, if not call the dealer and he can provide it.
Re key less entry have no idea but could be same issue.
You can recover the radio's serial code from the radio display and then find the code using the following online algorithm: <A HREF="http://www.a2dvoices.com/realitycheck/porsche/">http://www.a2dvoices.com/realitycheck/porsche/</a>