EP06-E over USB identified as 05c6:9008

I have EPXX-EVB and I just measured - both pins are floating there. If you have a Windows machine, I would suggest to try upgrading the firmware first (pm me for link). With a standard adapter like from your pictures I didn’t have any problems, only on some platforms (like apu3a2 with old bootloader and some old 3G industrial router). Maybe your problem isn’t actually the same as mine and in fact your firmware on the modem is broken (thus the QDL mode for emergency upgrade, see: https://www.96boards.org/documentation/consumer/guides/qdl.md.html).

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I pulled the W_DISABLE_N up, it didn’t change anything. Still shows up as 05c6:9008 with only 1 serial connection. So yeah, maybe I should just try to reflash this thing.

EDIT: Does this forum even have PM feature? I can’t find it. Maybe my account is too new for PMs. :frowning: I do have Windows machine.

User @Arni install QFlash + EP06ELAR03A08M4G and reach the proper detection of module but he receive Flaping of the COM-s and now he cannot re-programing or do anythink with module. Reseller give him this FW. I support him with Router stuff.

@alump - you should try other version then EP06ELAR03A08M4G.

Effect of QFlash + EP06ELAR03A08M4G =

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This looks like power related problem. Have he tried it on a different platform?
No issues with EP06ELAR03A08M4G on my side, I’m using it on several EP06 modules.

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First of all… massive thanks to you @pepe2k! I actually now saw 4 ttyports on Linux. So this device is alive. I probably just then got a device without any firmware.

But yeah. Device keeps on unregistering with EP06ELAR03A08M4G. It might be a power issue. But this is a massive improvement to earlier state already.

[114157.918591] usb 1-1.3: new high-speed USB device number 37 using xhci_hcd
[114158.019526] usb 1-1.3: New USB device found, idVendor=2c7c, idProduct=0306, bcdDevice= 3.10
[114158.019535] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[114158.019539] usb 1-1.3: Product: EP06-E
[114158.019544] usb 1-1.3: Manufacturer: Quectel
[114158.019548] usb 1-1.3: SerialNumber: 0123456789ABCDEF
[114158.026753] option 1-1.3:1.0: GSM modem (1-port) converter detected
[114158.027304] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB0
[114158.027501] option 1-1.3:1.1: GSM modem (1-port) converter detected
[114158.028304] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB1
[114158.028507] option 1-1.3:1.2: GSM modem (1-port) converter detected
[114158.029249] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[114158.029444] option 1-1.3:1.3: GSM modem (1-port) converter detected
[114158.029571] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[114158.031833] qmi_wwan 1-1.3:1.4: cdc-wdm0: USB WDM device
[114158.032368] qmi_wwan 1-1.3:1.4 wwan0: register 'qmi_wwan' at usb-0000:01:00.0-1.3, WWAN/QMI device, 76:4b:fd:dc:71:ec
[114163.217193] usb 1-1.3: USB disconnect, device number 37
[114163.217823] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[114163.217915] option 1-1.3:1.0: device disconnected
[114163.218534] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[114163.218619] option 1-1.3:1.1: device disconnected
[114163.219364] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[114163.219454] option 1-1.3:1.2: device disconnected
[114163.220158] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[114163.220243] option 1-1.3:1.3: device disconnected
[114163.220537] qmi_wwan 1-1.3:1.4 wwan0: unregister 'qmi_wwan' usb-0000:01:00.0-1.3, WWAN/QMI device

I will inject some extra power into it to see if that helps it unregistering.

I added extra 3.3V supply to the circuit, but issue still continues … so looks like I chose the wrong firmware. So there is no way to force device back to emergency download mode, to allow me to try another firmware?

I also pulled RESET_N up to make sure it’s not causing this, but that didn’t help.

If it is already normal in your Linux system, but it is abnormal in Windows system. You use the same module with the same firmware version, right ?
It is better to check the difference between the Linux test environment and Windows test environment, as you know that just the test environment is the variable. It may not the module firmware issue. Thanks!

It’s having identical issue on Windows now. So I can’t reflash it, as device stays up for few seconds only, before restarting itself.

So it never was normal, it just identified itself now correctly. But where before it felt like it didn’t have firmware. Now it has firmware but keeps crashing after few seconds.

Dear Alump,
If it is normal in Linux system, please try to send AT+QCFG=“usbnet” to check the default value. If the return value is not 0, please try to use AT+QCFG=“usbnet”,0 to reset it. Then reboot the module to have try again in Windows system. Thanks!

I would, if the device wouldn’t unregister and restart itself before i manage to send the first byte to AT port.

Some Quectel modules have USB_BOOT pin i could pull up/down to force device to start in emergency download mode. But EP06 doesn’t have this? Can’t find any mention on documentation.

EDIT: EG06 has the pin, but can I “easily” access it on this mPCIe card?

Dear Alump,
Yes, EP06 also have such pin, we have reserved the test point, please check the following picture. Thanks!
Please connect the two pins before power on module, then after the QDloader port appeared, please disconnect them. Thanks!

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Thanks, that did the trick. I managed to try flashing again, this time with EP06ELAR02A03M4G firmware, and it worked. At least device stays up now, and I can talk with AT port. Thanks again.

Ok, looks like many AT commands are returning Memory Error codes (23). Maybe I cheered too soon.

Dear Alump,
The firmware EP06ELAR02A03M4G is quite old, so may be some commands cannot support on such version. You may upgrade to latest version to have a try. You can email to support@quectel.com to get the latest fimware package. Thanks!

Did you also buy your modem on Ali (like @arni user)? He had the same problem.

Yes, it’s from AliExpress.

I wouldn’t be surprised if you got some fake/counterfeit or just damaged one.
Next time buy from official distribution/sources.

…and the official list of distributor/sources is available at?

EDIT: Looks like we have used different sellers on AliExpress, of course that doesn’t mean anything. Most like those are sold from the same piles.

It’s no longer on their website, so probably you should contact with their sales dep.

I suppose there should be a way to confirm with Quectel whether the module is original and where it comes from, based on S/N and/or IMEI.