Hi - Below the push button boot release is a key lock, under the lip between the number plate lights. Seems obvious but it is well hidden - I had to ring Lancaster Jaguar in Sidcup to ask where it was!
It's in the boot, or trunk if your in the USA. If the battery is flat, then you need to open the boot with the ignition key - look between the X and the K on the rear badge.
To open the boot of a 1997 Jaguar XJ8 with a flat battery, you can use the manual key entry. Locate the keyhole on the boot lid, insert the key, and turn it to unlock the boot. If the keyhole is not accessible or the mechanism is jammed, you may need to access the rear seat area and release the boot latch manually from inside.
To open the boot of an XJ8 with a flat battery, you can use the manual key entry. Look for a small keyhole on the boot lid or near the license plate area, insert the key, and turn it to unlock. Alternatively, if you have access to the rear seat, you may be able to fold them down and reach the boot release mechanism from inside the car.
take two back wheels off then undo exhaust then try boot it will defo work
To open the boot of a BMW X3 with a flat battery, you can use the mechanical key hidden inside the key fob. First, press the release button on the key fob to extract the key. Then, use the mechanical key to unlock the driver's door. Once inside, locate the boot release button or pull the emergency release cable, usually found near the rear seats or inside the boot area, to open the trunk manually.
To access the battery on a Jaguar XJ8 when the boot cannot be opened due to a flat battery, you can use the manual key to unlock the driver's door. Once inside, you can often access the battery by folding down the rear seats; there may be a release mechanism or pull strap located in the trunk area. If the seats do not provide access, you may need to remove the rear seat or use jumper cables from another vehicle connected to the front battery terminals under the hood, if accessible.
You need to pop the bonnet and get some jump leads and connect it up to the positive terminal under the plastic flap on the right hand side. Then attach the negitive lead to any metal part of the engine. This will power up the car and you will be able to use the keyfob to open the boot to gain access to the battery.
manually: insert key, turn, lift boot. voila :)
Use your key to unlock the door.
Unlock the door with your key.
Open the door with your key and pull the bonnet release.
Recently i had the same problem when my 2006 bmw 320i's battery went dead and everythng seemed locked, even the key got stuck and i had to pull it out forcefully. To open the boot you have to charge the battery, now you must be thinking thay battery itself is located in the boot. Right ? Still you can charge the battery from the bonet(hood) of the car. you can open it coz it can be opened manually. now on the middle left side of the hood, you can see a metal plate with a red cover on it. Connect the positive wire of your other charged battery with it, and connect the negative terminal with any of the screws you can find near that postive wire on the hood. Now try to start the car and once it gets started, open the boot of your car and try to replace the battery because it may happen again.Hope it may solve your problem.Nouman