That's the firmware Nintendo use to test the console!
LcdAndKey - Tests the display and touch
AssembledWireless - Tests the joy cons?,in both assembled mode and wireless mode.
Aging - No idea what is that.maybe the battery?
System Initialize - No idea what is that.
Board test - Tests the motherboard
BoardWireless - Tests Wi-Fi and Bluetooth
Finalize - Finishes the test
Repair shops would have loved to have that firmware!
But Nintendo will sue your ass if you sell that firmware
Make a copy of that firmware for yourself,then install a custom firmware.