How to downgrade firmware on UHD friendly drives?
Important Notification： Since March, 2019, many UHD friendly drive manufacturers have released new version of firmware, e.g. the firmware of ASUS BW-16D1HT has been updated to V3.10. In the latest firmware, a series of modifications are made to prohibit users to update firmware to support UHD movies via DosFlash or other tools. If the firmware version of your ASUS BW-16D1HT is 3.10 or above, please do not try the steps below any more, otherwise you will receive an error of “mtk vendor intro to master…” when using DosFlash tool to read the original firmware. The new procedure to update firmware is pretty complicated and requires professional skills. Therefore, we kindly recommend you to order a Plug and Play UHD friendly drive- CA-BW-16D1HT or Plug and Play UHD friendly drive- CA-BC-12D2HT directly.
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 of UHD friendly drive. If your UHD drive is not in the list, the tutorial does not apply to your UHD drive.
2. Preparation Tool
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.)
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.
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.
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”.
Don’t close the software, we need to use it later.
Step 2: Patch the dumped 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.
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.
Click the write flash button, select the firmware file just after patching (dumped_new.bin). Then wait for the burn to complete.
Now the Firmware downgrade is completed, please shut down all the software and restart the computer. After rebooting, please have a try to see if the drive can recognize and read UHD discs. If there are any unexpected errors, just try again or burn the backup dump.bin file to restore the drive.