@ Luis S. is spot on and Seriously suggest following the advise provided. The system is seriously compromised.
A possible solution is below.
Be aware - this will Wipe the Entire Drive of everything and there is No Recovery of any and all Data - period.
To perform this action will require booting from a Bootable Installer. This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of Big Sur would have to be done on a computer that Qualifies to run Big Sur.
Once that is done read on for preparing the Destination computer >> Special Notation - works on Intel Based Apple Computers & May on Apple Silicon M1 CPU
Extra Special Notation regarding the Touch ID equipped Apple Computer. About Startup Security Utility and Must Enable from Recovery Mode the ability to boot from External Drive Before Attempting
1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.
2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive.
3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives.
4 - Choose the Upper Most Drive ( not the volumes indented and list below ).
5 - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as APFS with the GUID Partition Map.
6 - Once that is done >> backup out of Disk Utilities and choose install macOS.
7 - Follow the prompts and it may automatically reboot several time.
8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.
>>>>>> Not to Use Migration Assist to restore the drive once the OS is installed. This will only Re-Introduce the existing problems back into the Virgin Installation of Big Sur <<<<<<