Crash dumps are not very helpful for stop 0xEF, because they does not contain the necessary data.
ETW minidump data unavailable So BSOD analysis will not be very effective here.
EXCEPTION_CODE: (NTSTATUS) 0x111d6080 - <Unable to get error code text>
ERROR_CODE: (NTSTATUS) 0x111d6080 - <Unable to get error code text>
And, it is a laptop. We will not be able to open it, test the hardware components and replace those.
If it does not boot in safe mode too, then there is almost no options in hand. Plus, it gives a hint of a hardware level error, as most of the drivers are inactive in safe mode.
I would suggest you to take the laptop to a Lenovo Service Center. If it is within a warranty, explore it.