Once it's had a generic map on it after being opened up, it shouldn't be locked out via obd mapping, I had 4 guys try to map over obd but failed which is becoming more common supposably ! Last guy had to open the ecu and map the chip Direct , he explained how possibly my ecu had had a trial map in the past which embeds into a different chip related to the immobiliser, ( excuse how vague that sounds, I'm not going To pretend I know the process of a map) he showed me my ecu's control parameters.
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