System Details
- Device: ASUS Chromebook 14 (CX1405CKA / CB1405CKA)
- OS: Windows 11 Pro
- Firmware Type: UEFI Full ROM
- Firmware Version: MrChromebox-2603.1 (04/09/2026)
- Internal storage type: eMMC
- Board Name: AWASUKI
Summary of the Issue
After successfully flashing the custom UEFI firmware (Chultofox/MrChromebox) and installing a clean copy of Windows 11 Pro on the ASUS Chromebook, the operating system is up and running, but essential hardware components lack driver support.
Specifically, the following core functionalities are completely unavailable in Device Manager:
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Audio: No audio input or output devices are recognized (internal speakers, microphone, and 3.5mm audio jack are non-functional).
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Wireless Connectivity: The onboard Wi-Fi network adapter and Bluetooth module are not detected, leaving the device without internet or wireless pairing capabilities.
Steps to Reproduce
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Prepared the Hardware: Put the ASUS Chromebook CX1405CKA into Developer Mode and disassembled the device to disconnect the battery (or used the appropriate method) to disable the hardware Write-Protect (WP).
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Flashed Custom Firmware: Ran the MrChromebox Firmware Utility Script via the ChromeOS crosh terminal and flashed the Full ROM / UEFI Firmware.
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Prepared Windows Media: Created a bootable Windows 11 installation media (USB drive) using Rufus, ensuring a GPT partition scheme for UEFI.
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Installed Windows 11 Pro: Booted from the USB drive, formatted the internal eMMC storage, and completed a clean installation of Windows 11 Pro.
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Completed Setup & Checked Device Manager: Went through the initial Windows setup (OOBE) using an external USB Ethernet adapter for internet bypass, then opened Device Manager to verify hardware initialization.
Expected Behavior
- Audio Infrastructure: The operating system should correctly identify the Intel Jasper Lake audio subsystem (Intel SST / High Definition Audio). The internal stereo speakers, internal microphone, and the 3.5mm combo audio jack should all show up as active playback/recording devices in the Windows sound settings.
- Wireless Connectivity: The onboard Intel Wi-Fi chip and integrated Bluetooth module should initialize during boot. Windows 11 should display available local Wi-Fi networks in the taskbar tray and allow seamless pairing with Bluetooth peripherals (mice, headphones, etc.).
- Device Manager Cleanliness: All core system devices, specifically the PCI buses, audio controllers, and network adapters, should successfully bind to working drivers, resolving the yellow exclamation marks under “Other Devices.”