serial usb adapter stopped on win11

Question

serial usb adapter stopped on win11

joe rojas 0

It works well in my old laptop with win7, the same happened with my laptop with win10. It was working well

and one day stopped. I did all, got a new driver, a old one, win11 almost hung me by the neck to use an old driver,

blocked the start, etc. The adapter is fine, the cable too, the external device is ok. I know the problem is the Windows upgrade. Gemini ai told me the solution is to use my old laptop with win7, I can´t believe.

I wouldn´t like to restore, because in the laptop with Win10 I did it and destroyed the system and I lost several software

educative licenses, including Matlab and AutoCad. In this one with Win11 I tried to restore too and had to fight two days

looking for a 40 character secret code that I did not have idea where it was, Windows blocked the laptop. I´m really afraid of all this stuff.

Now I am trying to stop win 11 does upgrades, force me to use service I don´t want to use, and tells me what I can do or not. I am a math and physics reseracher who needs to use old scientific software and old test instruments too. Plase let me do my job. I don´t use my laptops to play games, listen music, see photos or chat.

Please avoid to tell me that Win11 standars of security need I stop to do my work, that this it´s for my own good. I am

really tired of fighting wit Win10 and 11 but can´t use Win7 because then I can´t use internet well.

How can I do in order Win11 let me work with my serial USB device ?

Thank you,

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1 answer

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Answer 1

Hi, joe rojas

This is most likely a driver compatibility problem rather than a faulty adapter. Older USB-to-serial adapters often use Prolific, FTDI, or CH340 chipsets, and installing the wrong or outdated driver can prevent the COM port from appearing.

Here are some suggestions you can try:

Connect the adapter, open Device Manager, and look under Ports (COM & LPT), Other devices, and Universal Serial Bus controllers. Open the adapter’s Properties > Details, select Hardware Ids, and note the VID and PID values. These identify the actual chipset, which may differ from the brand printed on the adapter.

On the Driver tab, try Roll Back Driver if available. If not, select Uninstall device, check Attempt to remove the driver for this device, disconnect the adapter, restart Windows, and install the Windows 11 driver obtained from the chipset or adapter manufacturer. Windows documents rollback and reinstallation as appropriate steps when a device stops working after an update.

Check Settings > Windows Update > Advanced options > Optional updates for a compatible driver.

If Windows displays “A driver can’t load,” first look for an updated driver. As a temporary test only, you can turn off Windows Security > Device security > Core isolation > Memory integrity, restart, and test the adapter. This reduces security protection, so turn it back on afterward if possible.

A system restore or Windows reinstall should not be necessary for these steps.

Thank you for your patience in reading, I hope this information has been helpful to you.

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