Does anybody know, if is possible to remap the ECU with a laptop and OBD-socket over the internet?
It may vary from ECU to ECU, but the way a remap works is that you have a file (a "chipfile" containing all the settings and a software application with the necessary capability to write the chipfile to the ECU. I've only ever seen it done with a laptop directly connected to the OBDII port with a serial cable.
It would be easy enough to email the chipfile to a local tuner, but they would still need to have a copy of the right software installed on a local computer, I would think.