Go into the BIOS and check the version number. That will tell you if it updated or not. Some high end motherboards have Dual BIOS and or flash protection. What it's called and how it works depends on the manufacturer. If the flash fails, and its corrupted, it falls back to a backup copy of the original unflashed BIOS. In the old days you'd just get a totally black screen with no BIOS Beep. And a door stop or something cool to hang on the wall.
Just had a look. It does indeed give the updated BIOS version number, and the BIOS date (29th December 2016 in my case), which I presume is the date the new BIOS was flashed. Phew. New version number A0.13 as opposed to the old version (A0.07).
Computer Type: PC/Desktop System Manufacturer/Model Number: Pi Foundation Raspberry Pi 4B OS: Windows 10 IoT CPU: Broadcom BCM2711B0 quad-core A72 (ARMv8-A) 64-bit @ 1.5GHz Motherboard: Raspberry Pi Model 4B Memory: 4GB LPDDR4 SDRAM Graphics Card: Broadcom VideoCore VI Sound Card: Combined 3.5mm audio jack and composite video Monitor(s) Displays: 7 Inch Pi Foundation Touch Screen Screen Resolution: Two 4K displays at up to 4Kp30 or a single display at up to 4Kp60 Keyboard: Mini Wireless with touchpad Mouse: FT5406 10 point capacitive touchscreen PSU: USB C 5.1V @ 3A Case: Pibow Coupe Ninja Cooling: Heat Sink and Fan Shim. Hard Drives: 16 GB SanDisk Ultra Class 1 Micro SD card. Internet Speed: Gigabit Ethernet + 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac Browser: Edge Antivirus: non Other Info: Dual Micro HDMI
2 USB 2 ports and 2 USB 3 ports
40 GPIO pins
Bluetooth 5.0, Bluetooth Low Energy (BLE)
Camera interface (CSI)
Display interface (DSI)
Micro SD card slot
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