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How to downgrade firmware on UHD friendly drives?

If you're having trouble with firmware of downgrading, Plug and Play UHD friendly drive- CA-BW-16D1HT is highly recommended.

Currently, many newly purchased UHD friendly optical drives are no longer working directly. Don't worry. Downgrading the firmware could address the issue easily. Now I will explain how to downgrade firmware.

1. Check if your drive is supported.

Make sure your UHD drive is a UHD friendly drive. You may check it out at the list ofUHD friendly drive. If your UHD drive is not in the list, the tutorial does not apply to your UHD drive.

2. Preparation Tool

An empty USB drive, at least 2GB in capacity.
A desktop computer, an older operating system is preferable.
A Win7-pe ISO image file. (download win7-pe)
The software rufus. (download rufus)

3. Get Started

Please proceed as follows:

Step 1: Burn the ISO File to the USB Disk

Open the software rufus first, click the select button to select the downloaded win7-pe-x86.iso file, and then click the START button to burn the ISO to the USB flash drive. (Make sure your USB disk has no important data because it will be emptied automatically.)

burn usb disk

Step 2: Change Desktop Computer Bois Setting

Note: It is strongly recommended to disconnect your computer hard drive first to prevent a possible damage to your files.

Now please connect the UHD drive that needs to be downgraded to the computer.
Then insert the USB disk.
Turn on the computer and press Del to enter the Bois settings (The exact steps to enter the setting may vary according to your computer.), then find SATA mode selection, click and switch to IDE mode.

bois settings

For the latest operating system, you may not be able to find an option to set the IDE mode. So please try to use an older operating system.
Please change BIOS boot option in order to boot from the USB stick (NOT UEFI!)
After completing the above settings, you can save and restart the computer.

4. Downgrade firmware

When the PE system is successfully booted, you'll see the followings on your computer desktop, and there are already a lot of software we have to use on the desktop.

winpe desktop

Step 1: Dump UHD drive firmware

Launch "DOSFLASH\DosFlash32_BH16NS40.exe" software. Then click "read flash" button to dump the firmware to desktop and named as "dumped.bin".

dump firmware

Don't close the software, we need to use it later.

Step 2: Patch the dumped firmware

Launch "uhd-hex-dump.exe".

patch firmware

For the "Dumped firmware", you should choose the firmware file you just dumped(dumped.bin). The "Clean firmware" requires you to choose from the folder "Clean_NS50_compatible_firmwares" according to your drive name.

When the selection is complete, click the OK button. After the patch is completed, a firmware file with a new suffix will be generated on the desktop.

patch firmware

Important! Please copy the dumped.bin file to a USB flash drive for future restoration in case of a failure.

Step 3: Burn the patched firmware

Back to DosFlash32_BH16NS40.exe, change the task to write flash.

burn firmware

Click the write flash button, select the firmware file just after patching (dumped_new.bin). Then wait for the burn to complete.