Hi, my driver's handbook says to do as follows -
"Use the key to unlock the door, leave the key in the door lock;
Remove the fuse box cover;
Pull out the positive terminal (orange/red thing);
Use a jumper lead to connect this positive terminal to the positive terminal of a donor battery, and the second jumper lead to connect the donor battery negative terminal to the door catch (as you did);
The alarm will activate - switch it off by locking and unlocking the DOOR LOCK;
Then unlock the luggage lid with the switch;
Disconnect the negative cable first;
Push the positive terminal back in and cover the fuse box."
Note that I also had some problems doing this on my 2004 986, so keep trying. The buttons on the door sill did not seem to work, only the remote control would unlock the boot lid. I was able to open it with a fairly flat 12v motorcycle battery, so you don't have to have a full-size car battery as a donor. Also, make sure that the positive cable makes a good contact with the copper contact surface of the positive connector in the fuse box.
Hope that helps.
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