I have a GXB0709 Digital safe the batteries have gone flat and I have lost the Key . Can I get a replacement Key I think the number is 309093

No!

You have to contact the maker of the safe and request a key.

Lock Smith maybe able to help

Heat the safe, should bring the batteries up enough to open it. worked on mine.

if you have lost the key -- then look on the face of the lock cylinder and see if there are letters and numbers on it,, ( key code ) -- take this keycode to your local locksmith and see if they could make the key. if the code is not there then take the safe down to your local locksmith shop and have them pick open the safe. now if the safe is mounted in your house and cannot be removed - then have a locksmith come out and pick open the lock and make new keys for the safe.

c...

Hi,
I assume you have been able to open it with the key code up till now?
Its possible the batteries are flat. Most digital safes only have access to the batteries once it is open.
If you can access the batteries from outside try replacing them.
If the safe is only a cheap model use an angle grinder to cut it open, or take it a locksmith.
Good luck,
Steve

To order replacement keys, for small chests and files, you will need to know the key numbers which can be found right around where the key goes in. It should be a stamped number, letters, or both located around the keyhole. For Personal, Home and Home/Office Safes, you will need the model number and serial number. I think that the most economical place to buy keys is from www.SentrySafeShop.com. You can do a search for "lost keys" and it will give you a screen where you can enter your model number and key number. (It is a very easy screen to use. They just need 1.)Model # and 2.)Serial or Key #.)

In Summary:
For Small Chests or Files: A lock reference number is required. It will be a letter, a number, a letter and number, or "blank" (no letter or number), engraved/located on the silver cylinder of the lock. These are model numbers 0500, 1100, 1170, etc...

For Personal, Home and Home/Office Safes: (model numbers will begin with: S0, S3, S4, S5; I0, I3, I4, I5; A3, A4, A5; J3, J4, J5; L0, L3, ,CS,CSW,DA,DS,KS,KSW,MS,MSW,OA,OS,and SC): Indicate your model number and the safe serial number found on the front right-hand side of the door, between the hinges.
Here is the direct link to the key replacement screen: http://www.sentrysafeshop.com/Keys-Sentry-Safe-Replacement-Keys-p/keys.htm

This model is supplied with a key for emergencies. There is a plastic panel in the middle of the door with a silver sticker on which the moel number GXB0709 is printed . Lever off the plasic panel to reveal the keyhole.

I put mine on top of the AGA to heat it fro an hour. This brought the batteries up enough to open the safe. Sounds weird but it worked!

it sounds like it has reverted to it's factory setting if you can find the hand book it should be in there