Database Users

Won't recognize USB stick

I can connect my V20 to a Windows PC via USB cable, and transfer files back and forth. I had to pick something on a menu the first time I plugged in the phone.
However, if I plug a USB stick directly into the V20, it does not recognize it, or respond at all. My friend plugs the same USB stick into his V10 and an app pops up and shows the folders.
I'm using a micro-USB to USB-C adapter on the stick to plug into the V20. I know the adapter works, because I tested it when connecting to the PC.
I have searched settings for "USB" and it only comes up with USB tethering.
This is an AT&T stock phone, using the stock launcher. No root or anything.
Any idea how to get the USB recognized on the V20? Thanks.

it might be that the USB host function doesn't work with those adapters. have you tried plugging in a USBC to USB adapter and plugging a flash drive into that?
something like this
https://www.amazon.com/gp/product/B...rd_wg=lSGR4&psc=1&refRID=PMHQ664PCAEK6DN5N95J
or this
https://www.amazon.com/Anker-Devices-Including-ChromeBook-Aluminum/dp/B00XU6IMWY

I've tried the same thing without success. My note 3 & 4 worked fine. I also had a Note 7 and Nexus 6P and it didn't work with those either.

has there been any advancement on this issue?

Did anyone find the answer to this? My V20 used to boot up a USB stick but just stopped working one day.

Usb C hub

I am wondering whether anyone has connected a USB 3.0 hub to the Axon 7.
The reason I ask is that I am going on a trip soon and want to back up my camera SD card each day to a USB stick. I don't want to take a laptop. What I'd like to do is connect a USB card reader / hub to the phone to copy files from the SD card to the USB stick at USB 3 speeds. Devices like the Ravpower wd03 only do usb 2, which will take ages per file.
Will this work? Will I need a USB 3 otg?
Sent from my ZTE A2017G using Tapatalk

Update - USB Hub Works - but.....
OK, so I took the plunge and bought an Aukey USB C to USB 3 adaptor and a USB hub - one of these. I did it that was as I don't have other USB C devices.
The USB hub works fine with USB memory sticks. Each time i insert it registers a new USB OTG drive and I can happily copy to and from it (and more than one
But every time I insert an SD card into the SD reader, the Axon 7 gives me an error "Unsupported USB Drive: This device doesn't support thus USB drive. Touch to set up in a supported format". When I try to format the card, it fails.
Any ideas?

Update 2
I should add that:
1. The same problem occurs even if I use the MicroSD card I use in the phone - so it is not a formatting issue.
2. I also have a Note 5. If I connect the USB hub to that via a USB OTG, the Note 5 can happily read the SD Card.
3. The SD slot USB Hub works fine when when plugged into a PC.
Do I need an additional USB OTG? Will that conflict with the phone?

Update 3!!!
This is getting ridiculous but I want it to work.
So I tried plugging a SD Card reader into the USB hub. Lo and behold it works!!!! I wonder whether the issue is just that the SD card reader in the hub is missing something which allows the Axon to read the SD card.
That was only USB 2 - I am going to invest in a USB 3 SD card reader (my camera produces large files!) So I am going to invest in a small USB card reader and will report back.

Update 4
So the card reader has arrived as has my USB 3 stick. Now I can copy all the files from the SD Card to the USB Stick.
The only issue is that Dropbox scans the cards and starts trying to upload them as Camera uploads so I've had to kill the process.
The other issue is that my file manager (File Manager HD) doesn;t allow copying and I have to use the System file Manager, which is awful. Am going to work on that process over the weekend. Any suggestions gratefully received on that front!!!

Rubbish. Rubbish. Rubbish
The connection just isn't stable enough. The phone keeps saying that the card(s) keeping g being disconnected / removed. There is nothing wrong with the hub or either the USB stick or the sync card / card reader.
Last chance - I will add a power supply to the USB hub. If that doesn't work I'm afraid my views will be confirmed - this is a great phone with a great DAC but other than that it is just a bit rubbish and cheap for a reason, with a manufacturer which doesn't want to develop for it. I'm the EU least.
Sent from my ZTE A2017G using Tapatalk

Anyone else not seeing OTG USB Devices?

I have no luck getting devices to show or mount within Stock B27.
Flash Drive LEDs will blink upon booting up but then nothing after the phone is fully booted.
We know that OTG works fine on the Axon 7.
I know my hardware/adapter is mounting USB devices and works fine within TWRP.
I'm on Stock B27 by DrakenFX
Rooted
Unlocked Bootloader
Write Protection Disabled
Am I all alone? Any tips?

What devices are you trying to connect to your phone?
I had some issues at first, but realized I had to wait a bit longer for the phone to analyze the USB sticks or external 2.5in USB drives or external 3.5in USB drives.
When I plugged one in, it would show the little OTG symbol for something is connected, but the phone would be thinking for awhile before it would actually show up as a drive.

Have you tried a different rom? See if it's just a stock issue?

nolimit78 said:
Have you tried a different rom? See if it's just a stock issue?
Click to expand...
Click to collapse
I haven't tried any other ROMs yet. I prefer to stay stock because aside from the OTG it works great and it's my daily driver. I may update to Nougat after a week or so. Kinda letting the update dust settle.

mozerxdaven said:
What devices are you trying to connect to your phone?
I had some issues at first, but realized I had to wait a bit longer for the phone to analyze the USB sticks or external 2.5in USB drives or external 3.5in USB drives.
When I plugged one in, it would show the little OTG symbol for something is connected, but the phone would be thinking for awhile before it would actually show up as a drive.
Click to expand...
Click to collapse
I tried several devices, Flash Drives, Portable HDDs, SD Card readers, etc.
I've also tried plugging my 1GB flash drive in and restarting device.... waiting.... and no luck.
I'm under the impression it's something within the OS just not enabled/

I have the svae problem on Chinese device with European B09 rom.
Tried to connect through the adapter that comes included, and no response.

larsky said:
I tried several devices, Flash Drives, Portable HDDs, SD Card readers, etc.
I've also tried plugging my 1GB flash drive in and restarting device.... waiting.... and no luck.
I'm under the impression it's something within the OS just not enabled/
Click to expand...
Click to collapse
Do you get the little OTG symbol that says something is connected when you plug anything to it?
I also had a problem once, which turned out to be a faulty adapter.

I've tried three different adapters (including the one that comes with the A7). I see the flash drives LEDs blink upon boot up but not after phone is fully powered up.
I was getting the contents on flash drives on Twrp but now I can't get that. Not sure what I've done differently, but I'll keep digging.

larsky said:
I've tried three different adapters (including the one that comes with the A7). I see the flash drives LEDs blink upon boot up but not after phone is fully powered up.
I was getting the contents on flash drives on Twrp but now I can't get that. Not sure what I've done differently, but I'll keep digging.
Click to expand...
Click to collapse
I'm having the same issue. Tried 2 different micro USB otgs and 2 different adapters and no go.
Has anyone tried the type c OTG and not the micro with the adapter?

Dunka said:
...
Has anyone tried the type c OTG and not the micro with the adapter?
Click to expand...
Click to collapse
I'm on stock B10 (A2017G) and have successfully used an OTG type C cable to transfer files to an external 3.0 HDD. It was fully powered by the phone.

You will need a USB-C to USB-A 3.0 Adapter to get it work, devices won't work attached to a normal USB-C to Micro USB Adapter. Neither with the adapter comes with the phone nor with an aftermarket (56K resistor) adapter.
https://forum.xda-developers.com/axon-7/accessories/usb-otg-usb-c-to-usb-3-0-adapter-t3544363

thefiqs said:
You will need a USB-C to USB-A 3.0 Adapter to get it work, devices won't work attached to a normal USB-C to Micro USB Adapter. Neither with the adapter comes with the phone nor with an aftermarket (56K resistor) adapter.
https://forum.xda-developers.com/axon-7/accessories/usb-otg-usb-c-to-usb-3-0-adapter-t3544363
Click to expand...
Click to collapse
This is what DrakenFX recommends and works for him. This is also what I am using. It's definitely a software bottleneck somewhere in my case at least.
The USB-C to USB 3.0 Adapter I got is the one below:
https://www.amazon.com/gp/product/B01EL4PVFE

thefiqs said:
You will need a USB-C to USB-A 3.0 Adapter to get it work, devices won't work attached to a normal USB-C to Micro USB Adapter. Neither with the adapter comes with the phone nor with an aftermarket (56K resistor) adapter.
https://forum.xda-developers.com/axon-7/accessories/usb-otg-usb-c-to-usb-3-0-adapter-t3544363
Click to expand...
Click to collapse
Got my Type C OTG cable and can confirm that it works without a hitch.
Got this one from Amazon
https://www.amazon.com/gp/aw/d/B017...type+c+otg&dpPl=1&dpID=41+5ur8uEVL&ref=plSrch

[Q] USB OTG behaviour

Hi,
So I'm developing an app to communicate over serial with a HID and testing on the g6 is proving troublesome.
The scene:
-Hid/USB Permissions granted
-Device filter correct and working as intended
-Goal is to send a string over serial.
Allthough I'm 100% sure my test code is correct, the app cannot open a serial port.
Is it normal behaviour in recent versions of android for the device to recognise an otg cable as a power source? Even with no other device connected? Are there any known issues opening serial ports on the g6? (7.0)
The cable works as intended when I plug a mouse or keyboard in but refuses to open a serial connection when my takget device is plugged in. It recognises it as a HID an can pull the serial number etc.
The android serial library should not require root or any other hackery So I'm a bit confused. I've ordered a few other otg adapters just in case.
Anyone who knows what might be going on pleas pitch in.

I've had some issues getting a serial adaptor working as well. I'm on 870DS. Originally tried the wired version of this:
https://forum.xda-developers.com/an...odemu-connect-android-to-30pin-t3234840/page1
Thank God the developer changed to Bluetooth. I tried about 6 different otg cables. Worked fine on other non usb-c phones.

I suspect it is the adapter too...sucks so bad. The annoying thing is that I was so confident in android serial that I wrote a lot of code before I bothered testing the concept lol.

Does your OTG work on memory sticks OK? I have a G6 h870ds. My OTG only works for me with USB3 OTG adapters and USB3 memory sticks. I don't have a USB3 HID device to try. I now have a large collection of different OTG adapters and memory sticks. I opened up some of the adapters to buzz them through to make sure they were made correctly. They were! It took a while for the penny to drop why some things worked and some didn't!
I cant use USB2 OTG adapters or USB2 memory sticks, keyboards or cameras. Initial connection of the USB2 OTG adapter is recognized but no connected devices are detected. I used an app called USB Device Info that can give me details of detected devices and only USB3 devices are ever detected.
I have a USB2 memory stick with an LED on it. When it is first connected to the OTG cable it flashes in a way that leads me to think it is trying to reply to USB bus interrogation but something (probably software) fails. The phone connects to my USB2 PC port just fine so I don't think the hardware is at fault. I've reset the phone and upgraded to Oreo too but alas that didn't help.
A friend of mine has a G6 H870S and all my adapters and memory stick combinations work fine on his phone so I find myself wondering if I'm just unlucky or whether the dual sim version is subtly different in some way.
I fully admit I know nothing about the inner workings of USB but as far as I can determine USB3 uses all of the USB2 connections and the additional connections only available on a USB3 port so the hardware should be OK. I'm guessing most HID devices are USB2 but if its a USB3 could you possible have a related problem but in reverse?
Every time I plug in any USB OTG adapter I get that same pop up screen that defaults to select as "power supply" even with no device connected whatever I have previously chosen.

What works for me is to plug in the OTG adapter, and only then plug in the memory stick to it. Otherwise I get the "Power supply" thing too.

Arak0n said:
What works for me is to plug in the OTG adapter, and only then plug in the memory stick to it. Otherwise I get the "Power supply" thing too.
Click to expand...
Click to collapse
Leaving just the OTG adapter connected for a few seconds then attaching the usb device does not help. USB2 devices are never detected but all my various USB3 memory sticks work reliably when using a USB3 spec adapter. I've given up worrying about it now and accepted that there is just something a bit iffy about my G6.

Yoga Book YB1-91L USB port problem

Hello everybody. Asking for help and suggestions. Maybe LENOVO representative take notice. Have secondhand yoga book. Resolved almost all problems but micro USB port. First of all, charging device died out. Find 30-watt charger with QC 3.0 and charge now working perfectly. Next tried to connect mouse, usb hub and usb dongle. Each time got DEVICE NOT RECOGNIZED message. Got error in device list.
But......tried to connect external HDD with noname HDD box and it connected. Connection may work to copy, install files or disk may disconnect randomly.
Tried system restore, tried to change drivers ( intel drivers for chipset not avaliable now) with no luck. Think problem is with low port current, but even small mouse and dongle make error and non-SSD HDD work 9 times out of 10. Have anybody experience problems with connecting devices to micro USB port?
Tried 3 different OTG cables and OTG micro USB to USB dongles. No luck.

Maybe the port is corrupted or desoldered
Sent from my Pixel 4 using XDA Labs

I did change it with the warranty I had. I had the same problem and did not want to fix by myself as the warranty was still active