LightBurn not detecting Longer Nano Pro 12W on MacBook M4 (macOS Sequoia 15.3.1) – CH340 driver won’t install or activate

[Kerstin1712 (Kerstin)]

Hi everyone,

I’m trying to get my Longer Nano Pro 12W laser working with LightBurn on a MacBook M4 running macOS Sequoia 15.3.1, but the device isn’t being recognized at all. I’ve spent several hours trying different approaches, but the CH340/CH341 driver simply won’t load or appear in the system.

Here’s everything I’ve tried so far:

1. Installed the CH340 driver from Longer’s website
   – Followed the official instructions (.pkg installer).
   – No driver appears in /Library/Extensions.
   – No security warning or “Allow” button appears under Privacy & Security.
2. Installed the official WCH driver from wch-ic.com
   – Ran the CH34xVCPDriver.pkg installer (no error or prompt shown).
   – After reboot, there’s still no /dev/tty.wchusbserial….
   – Checking /Library/Extensions only shows HighPointIOP.kext and HighPointRR.kext.
3. Changed macOS security policy
   – Booted into Recovery Mode → set Reduced Security → enabled
   “Allow user management of kernel extensions from identified developers.”
   – Rebooted, but still no CH34x driver in /Library/Extensions.
4. Tried manual and Terminal-based installation
   – Attempted to extract CH34xVCPDriver.kext from the .pkg manually (not visible in current WCH package).
   – Tried sudo kextload, but got No such file or directory.

So at this point LightBurn cannot detect the laser at all — ls /dev/tty.* shows no wchusbserial entries.

Has anyone successfully installed the CH340 driver on macOS Sequoia 15.x with an Apple Silicon (M1–M4) Mac?
Or can anyone share a working method or driver version that properly exposes the serial port for the Longer Nano Pro 12W?

Thanks so much for any help or confirmation

—
(MacBook M4 • macOS Sequoia 15.3.1 • LightBurn 1.x • Longer Nano Pro 12W)

[gilaraujo (Gil Araújo)]

Hello Kerstin

Are you connecting directly to the M4?
If so try a 3 port hub in between.

Mx macs are notorious for silently ignoring ports that dont fully handshake on 3.0.

You can also do a search on the terminal

Unplug the laser:
Open terminal

Paste: ioreg -p IOUSB

press enter

Plug laser, power it up
Paste: ioreg -p IOUSB

You might notice no new device is identified.

The hub - which usually have a USB 2.0 chip - will drop all coms to 2.0 and laser should be seen.

[Kerstin1712 (Kerstin)]

Hi Gil,
I am using a 2.0 USB Hub running it with an M4. I get the following answer:

kerstin@kerstinsmacbook-pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 35>
  +-o AppleT8132USBXHCI@01000000  <class AppleT8132USBXHCI, id 0x1000004d2, reg$
  +-o AppleT8132USBXHCI@00000000  <class AppleT8132USBXHCI, id 0x10000046e, reg$
  +-o AppleT8132USBXHCI@02000000  <class AppleT8132USBXHCI, id 0x1000004d0, reg$
    +-o USB2.0 Hub             @02100000  <class IOUSBHostDevice, id 0x10000122$
    +-o USB3.0 Hub             @02200000  <class IOUSBHostDevice, id 0x10000124$
kerstin@kerstinsmacbook-pro ~ % ioreg -p IOUSB
+-o Root  <class IORegistryEntry, id 0x100000100, retain 35>
  +-o AppleT8132USBXHCI@01000000  <class AppleT8132USBXHCI, id 0x1000004d2, reg$
  +-o AppleT8132USBXHCI@00000000  <class AppleT8132USBXHCI, id 0x10000046e, reg$
  +-o AppleT8132USBXHCI@02000000  <class AppleT8132USBXHCI, id 0x1000004d0, reg$
    +-o USB2.0 Hub             @02100000  <class IOUSBHostDevice, id 0x10000122$
    | +-o USB Serial@02120000  <class IOUSBHostDevice, id 0x100001255, register$
    +-o USB3.0 Hub             @02200000  <class IOUSBHostDevice, id 0x10000124$
kerstin@kerstinsmacbook-pro ~ %

[gilaraujo (Gil Araújo)]

@Kerstin1712

+-o USB Serial@02120000 <class IOUSBHostDevice

If you launch LightBurn AFTER you power the laser, and check the dropdown. do you get a serial port ?

It is there listed.

[Kerstin1712 (Kerstin)]

Hi Gil,

yes I see it and it´s connected, but the console shows weird signs:

I played with the baud rate as well, but that didn´t help either.

[Kerstin1712 (Kerstin)]

Also, after the installation of the CH34x USB to Serial Driver, I only find the cu.usbserial-210, not a wchusbserial…