Battery dead boot locked and wont open manually
If you have a trailer plug in the rear of the vehicle, power can be feed into the correct terminals to allow for electric things to work. Also, the interior power outlet for the cigarette lighter can be used as a port to feed in power with any cigarette power lead. Just be sure to use the negative with the same polarity.
For that matter, if the interior is accessible, you can uncover the fuse panel and feed power into the fuse block. Any 12Volt battery will provide enough power to open the boot.
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