Query on electronic safe (by 2 users)

I am not familiar with Lexsor safes, but I have dealt with another brand. The lack of beeping probably means the internal battery died. Some safes I've seen have external power contacts that are used to restore power long enough to open the safe and replace the internal battery. Look to see if your safe has these; if so, it may require a safe/brand-specific device to restore power or it could be rigged with a simple battery. You'll need to find a manual for more information. If there is no way to power it externally, or it requires special equipment, you'll need to take it to a locksmith/safe-crack/keymaker (and it will likely cost you quite a bit)