The only supported way to replace the startup logo with a custom logo is to modify the Boot Graphics Resource Table (BGRT) on a device that uses UEFI as the firmware interface. Ensure that the AC adapter is plugged in and that the main battery is installed properly. 
Insert the command dir (dir = list directory) at the DOS-Prompt to list all files on the drive.
The way dell knows what your serial number is is a program called eeprom reader that they install on all new dells. Universal BIOS Backup Toolkit is a lightweight, easy-to-use and straightforward application that can quickly collect data about your system's BIOS and save 
Granted, it can be argued that you could have achieved the same with other flash tools Changing the Settings. Be sure to save your changes before exiting the CMOS Setup.
The software running in the BIOS is Insydeh20 setup utility. Everytime i boot, i have to face that creepy father-son (chairman n his son) logo. This utility can use an optional settings file called PHLASH. Here, click on the “ Paste ” drop-down button and select the “ Paste from ” option. This tool is for BIOS installation in WinPE10. EPA pattern and the logo can be safely removed from the BIOS to make more space for the full-screen logo. 
\\SCS-CFGMGR-MP\SWSTORE\BIOS\Dell CCTK\~Configs. When the red Compaq logo or blue HP logo displays, press F10 repeatedly until a BIOS Setup utility screen opens, or press F1 to get help. If you miss it, just wait for Windows to finish starting and try again.
1E BIOS to UEFI is a utility that we created at 1E to abstract all of the various commands that need to be called (in the correct order) in order to change the settings required to move to UEFI. Specify the command line for the MBR2GPT tool. Enter the System or Admin Password to access the BIOS settings. Then load the defaults by selecting Load Fail-Safe Defaults, Load BIOS Defaults, or whatever your BIOS manufacturer has named this function in your particular type and version of BIOS.
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