Dear Jiaszzz_ROG,
Thank you for your reply.
I will first answer your questions and then append a summary of what I have and have not tried.
I have attempted USB C to USB C connection between the motherboard and AS Media controlled enclosure BOTH on the Front Panel USB C connector and also on the motherboard backplane two connectors.
The front connector does not acknowledge the presense of the AS Media controlled drive. The two motherboard backplane connectors do show the enclosure connected.
The two motherboard backplane connections appear as USB 2.0 and with correspondingly slow speeds like 30~35 MBps.
When I connect a SSK USB C SSD thumbdrive to the motherboard, I get USB 3.1 Gen 2 10 Gbps connections on all 3 connectors, (the two USB C motherboard backplane connectors and the Front panel connector).
So the motherboard hardware is working.
My Z790 Creator WiFi bios version is 0814. I am very uncomfortable with BIOS / Firmware updates because there is a high risk of things going wrong. So unless you are certain that doing such an update will solve this problem, I am reluctant to try that.
The drive enclosure works perfectly find with eSATA connection, and with USB C to USB 3.1 Gen 1 Type A cable. The speeds for eSATA are around 500 MBps and between 300 and 400 MBps on USB C to USB 3.1 Gen 1 Type A cable.
The AS Media controlled enclosure works perfectly fine USB C to USB C 10 Gbps on a Lenovo latop running the same Windows 10 Pro operating system as the Z790 motherboard.
I have tried a clean install of the latest Windows 10 Pro and the latest Serial I/O, Thunderbolt, Chipset, ME Interface, and Intel VMD drivers. No correction of the problem with the latest software.
The absolute latest version of the AS Media Firmware only seems to be available on the USBDEV.RU website and bears a caution that the latest firmware will disable the led activity lamp. .RU based websites have a risk of malware that makes me uncomfortable more than the potential loss of the activity led.
Here is a summary of all that has been done:
I have a SSD in a USB external enclosure which is rated for USB 3.1 Version 2 ( 10 Gbps ) and I am connecting it by USB C to my Asus Z790 Creator WiFi motherboard. I am getting only USB 2.0 transfer speeds. I think the problem is that l need some updated driver. I tried finding a newer UASP / UAS driver, cannot find any driver on the internet that will install. I always get the "The driver you have is better than the one you are trying to install" error message.
I have tried 3 different cables. One was very clearly marked USB 3.1 Super High Speed.
In both of the two motherboard mounted USB C connectors, I get the the same USB 2.0 speed result.
In the front panel mounted USB C connector, the motherboard would not even recognize that anything was plugged in.
I tried an SSK USB C-SSD thumb drive in the front panel USB C connector and it worked perfectly at 3.1 Gen 2 Speeds, about 420 write and close to 500 MB/s read.
I have updated the Z790 Creator WiFi Intel Chipset Driver,
the Intel Management Engine,
the Intel Management Engine Interface,
the Intel Serial I/O,
and the Thunderbolt drivers.
I have also tried updating the USB Enclosure firmware, but
I did not understand how to properly save the original firmware,
and I did not understand that station-drivers.com lists firmware chronologically by the DATE OF UPLOAD, NOT THE DATE OF THE FIRMWARE.
So, I accidently loaded an older firmware.
The website did not have a firmware newer than mine, and the firmware of the same date of mine that they had on the site,
had a different checksum, which I think mean't it was for a slightly different enclosure.
I loaded that since I could not get back to my original firmware.
The enclosure still works okay for USB C to USB A 3.1 Gen 1 connections ( 5Gbps ) on my Z790 motherboard,
but still reports USB C to USB C connections on the motherboard backplane 10 Gbps ports as if they were USB 2.0 with corresponding slow 30~35 MBps speed.
I connected the USB enclosure to a Lenovo laptop same Windows 10 Pro OS with USB C to USB C connection and HWInfo64 shows USB 3.1 Gen 2 Superspeed port connection on the laptop.
So the USB enclosure is capable of 10 Gbps connections.
So I think I need some updated driver for the Z790 motherboard.
MS Update Catalog has some AS Media drivers, but none of them will load.
They are likely for an AS Media host controller, not a USB enclosure.
I also got a USB C female to USB C male extension and tried the SSK USB SSD thumbdrive on the backplane two motherboard USB C connectors on the Z790 and it worked fine at 420 MBps / 500 MBps super speeds and the ports show as USB 3.1 Gen 2 in HWInfo 64.
So I am pretty sure the USB C hardware ports on the Z790 are okay. It really seems like a driver issue since the Enclosure works at USB 3.1 Gen 2 speed on the laptop.
There are later firmwares for the enclosure on a Russian website, usbdev.ru but I am afraid of trying them because they say that the activity led will no longer work if you use them.
That does not sound like a good match.
I created a list from Driverstore Explorer and found it was too complicated since my machine was an upgrade from Windows 7, so I used Macrium Reflect, created a backup, then did a clean install of Windows 10 Pro. No help with the problem.
Next I loaded MoKiChU's latest drivers: Serial I/O, Thunderbolt, Intel Chipset, MEI, VMD. No help with the problem.
Next I combed the internet. There are a LOT of complaints of Windows 10 and Windows 11 machines mistaking devices connected with USB C 10 Gbps as USB 2.0 devices.
I guess I am lucky that the Lenovo laptop does not have that problem and works fine with the AS Media ASM235CM enclosure. I did find some suggestions which I tried:
I tried copying over uaspstor.sys with the usbstor.sys driver. That required the madness of finding a way to set the Administrator user to have full privileges to get rid of the TrustedInstaller error message, and also had to boot into Safe Mode from Windows with Networking and takeown /f the file right before overwrite. Note: it will say it copied even though it did not. You have to see the overwrite dialog in the CMD window run as Administrator. Argh !!! No help with the problem.
I tried unchecking allow the USB ports to power off. No help with the problem.
I tried changing my motherboard bios settings from Legacy to Auto to Disable Legacy. No help with the problem.
