Haven't heard of a way to lock the ECU with Ecuflash on the X but I'm not a tuner myself. Tephra roms are Vin-locked but should be able to flash anything else over it.
However, to the best of my knowledge the Cobb Accessport will lock the ECU and you'll need the original Accessport to unmarry it from the car. I haven't used one so I don't know the specifics but I did read Cobb might be able to send you an unlock code or map.
If you can't get the AP, then a bench flash will be required. I guess it depends on how much you trust the Mitsubishi dealer (it's hit or miss here in the US) but I can't imagine they don't have tools to bench a stock rom into a locked ECU.
2011 WW MR -
MHI 18k / ID 1300x / Walbro 450 / WTF Tuned Flex Fuel Kit / Cobb Hard Pipes / Tial QRJ / ETS Intake / ETS Recirc Downpipe / ETS HFC / Invidial Q300 / DrivenFab Recirculated AOS
Chris Carbee Tuned on Tephra v3, making 400 horsepower to all four wheels, because that's the only place power should ever be.
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