Hi Sharmi Devi,
BitLocker encryption cannot be cracked or bypassed because it contains no backdoors, meaning your data is completely inaccessible without the original forty-eight-digit recovery key. This key is often automatically backed up to the personal Microsoft account used during the initial setup of your Dell laptop, or within a work or school network directory if the device was managed by an organization. You can check for it by logging into the official Microsoft account recovery portal from another device. If the key cannot be found through these locations, the encrypted files are permanently lost, and the only way to make the laptop operational again is to perform a clean Windows installation, which will format the drive and erase all existing data.
Hope this answer brought you some useful information.
VPHAN