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Did you check the oil level, common one for the SERv light to be on and there to be no other lights indicated would be oil low. And as above, on a clio SERV indicates a fault, not that it needs a service.
You need the unlock coce by the sounds of things, get the tuner, download the software then just use that to send the code needed to Fastchip and Henk will sort you out with 8 digit unlock code.