Windows Support Drivers fail to install on a brand new MacBook Pro 16

Assuming you used BC Assistant -> Action -> Download and a USB2 Flash drive, can you check the Bootcamp.XML for the Product Version line? It should look similar to

		<ProductManufacturer>Apple Inc.</ProductManufacturer>
		<ProductVersion>6.1.8034</ProductVersion>
		<ProductCode>{FCFFE6B6-BAE8-490E-88D0-097A9DA1C43D}</ProductCode>

The ACPI 34BA device is a know issue. See Boot Camp: Unknown device in device manag… - Apple Community as an example. However, the drivers for the NCM devices should be available. What is the PID/VID of the NCM devices?

This is the Apple NULL device. Right-click on the device -> Driver -> Have Disk -> Browse and point to the AppleNullDrive -> AppleNull64.inf and try to install the driver.

What is the PID/VID of PCI device?

Does BC Assistant -> Action -> Download fail?

Based on Identify your MacBook Pro model - Apple Support, there are two variants of the 16-in model - 16,1 and 16,4. Can you check About This Mac -> System Report -> Model Identifier and verify what you have?

The value you show is for a MacBookPro 16,1.

		<ProductManufacturer>Apple Inc.</ProductManufacturer>
		<ProductVersion>6.1.7748</ProductVersion>
		<ProductCode>{FCFFE6B6-BAE8-490E-88D0-097A9DA1C43D}</ProductCode>

AleSSANDRO NAPOLI wrote:

By the way when trying to install the Windows support drivers see the link below to see why it's failing

https://discussions.apple.com/thread/252085027?answerId=253983665022#253983665022

That is an EFI issue.

AleSSANDRO NAPOLI wrote:

I had to go for the third clean BootCamp Windows install. Here is the deal. Windows 10 has a new update out there, when that update happens the BootCamp Bluetooth drivers fail and Windows 10 dies.

Interesting. Did you install Windows using an older ISO?

I guess this puts the ball in Apple's court for the release of compatible drivers.

Apple is trying to get away from Bootcamp. However, they may show some interest, but it is very rare. A bit surprising that Windows chose to 'break' the existing drivers, which work properly on a prior release of W10.

Can you try to install individual drivers by hand?

From AppleNull64.inf....

Your devices are

%SYSTEM_DEVICE% = NullDeviceInstall,PCI\VEN_106B&DEV_1802

%NCM_DEVICE% = NullDeviceInstall,USB\VID_05AC&PID_8233

Also, are you able to repair the Bluetooth driver.

Be aware that there have been known failures of the BT hardware on the 2019 16-in model. See 16-inch MacBook Pro Bluetooth issue - Apple Community for reference.

You have the correct drivers package. What are the errors you see when trying to install the drivers? Is there a specific driver that is failing?

What is the PID/VID of the unknown devices? Here is an example of finding the PID/VID of the device.

Also, can you try to install the Broadcom Ethernet driver and check?

This should also be in the AppleNull64.inf. Did the NCM device install correctly?