[xiaomi mi mix2s] USB connection to PC problem - Android Q&A, Help & Troubleshooting

Dears,
I checked few forums for miui and couldn't find solution to my problem.
The issue I have is causing that PC doesn't see the phone. What I have tried:
- different cables
- different PCs
- debbuginig is on
- restore factory defaults
- reinstall drivers for PC
- MIUI PCsuite
nothing above works.
I was oryginally on custom miui, with installed TWRP. However, I thougt that this was rootcause of the problem. I decided then came back to MIUI Global 11.0.4. Global ROM I installed via OTG. With this move I lost TRWP and now, don't have PC access to reinstall TWRP. So currently I'm not sure what are my options to instal that again.
Regarding USB diagnose, when it's connected to PC, phone bips when it plugs and charges, however nothing comes up to select MTP. I change in system to either transfer photos, connect as MTP. None of the other options worked either. I run also diagnostics tool on the phone to check if USB port works and in both charging and OTG connection with reverse plug works fine. Fastboot works, but due to the fact, PC doesn't see the phone, ADB hasn't hooked it up. Means, updating system via console is not an option, unless USB detectability will be restored...
Any ideas what to do to restore PC connectivity? Appreciate any guides how to resolve this issue. If similar problem has been already resolved, I would be thankful if someone would direct me there either on PM or below this post.
I tried to find help on miuipolska but they thrown away my post into the bin and said I'm lazy spammer, gave me penalty points, locked my account and said because of people like me their forum looks like trash... So yeah plenty of help from them....
Thanks in advance for your help.

---

windows/linux?

---

aIecxs said:
windows/linux?
Click to expand...
Click to collapse
Windows

---

connect the phone in mtp mode. open device manager, uninstall drivers. disconnect&reconnect phone in mtp mode (developer settings - usb config) and usb-debugging enabled. if drivers not installed automatically, download qualcomm_driver.zip or usb_driver_r12-windows.zip (try both)

---

Hi,
Thanks, I did already but re-did once again with your drivers, still nothing. In my opinion it looks like phone stuck on charge only mode, regardless what is selected as a default USB action. There is a chime when usb is plugged but nothing happened on both PC and phone ... Any other ideas?

---

adb works in any usb mode even in charging only. problem must be with drivers or physical connection. try usb 2.0 port on windows 7

---

I've tried on 2.0 & 3.0 nothing works. My last software change (when this issue occured) to global I did via otg. I thought (in that time) that's a software issue, and took it back to original ROM. Would that be possible (installing global software via OTG) if phone's USB would be broken?

---

i am confused about what's the current state of your device. is fastboot working or not? if fastboot available, why did you say you can't install TWRP? you know you can enter fastboot with vol dn + power?
i wouldn't say it's possible using OTG if usb connector is broken physical
if phone is charging and no yellow triangle in windows devices manager, this means drivers are installed. there is no pop-up on this device because of persist.sys.usb.config=none in /system/etc/prop.default which mean you have to re-select MTP in developer options each time AFTER you connected the phone, again
in TWRP there is adbd running (after decryption successful) and MTP should work too, but you need to install drivers again because each boot mode is announcing itself as new device
another reason for adb not working is power shell (windows 10) download latest platform-tools open C:\Windows\System32\cmd.exe cd into folder and run adb.exe from there instead
if you think the MIUI causes this issue i don't think this is a bug, more like maybe some unclean rollback/ mixed up ROM/firmware. in this case (as last option) i recommend to backup /data and /sdcard from twrp and start with a clean install. use the XiaoMi MiFlash tool it does not require adb for flashing
for the backup you can boot twrp from fastboot without flashing with "fastboot boot twrp.img" it will hopefully decrypt userdata (check if data is mounted and files readable) then backup userdata only. pictures and downloads not included in backup, you need to run "adb pull /sdcard" manually after this (and of course save TWRP backup to PC)

---

Hello,
I'm able to put phone into fastboot - the issue is, Pc doesn't see the phone in that mode - therefore I'm not able to load in TWRP. I had TWRP before, but after loading global software via OTG, TWRP gone. I have tried to plug phone and then swap MTP options - still doesn't work.
Phone is charging, and no prompt message comes in on computer - so as you wrote, no missing driver. However, I still cannot see phone connected to the PC.
I tried ADB as well, to detect the phone through fastboot devices option - nothing.
When I pressed power and vol+, then it brings up simplified ''TWRP'' with only 3 options:
-Reebot
-wipe data
-connect with miAssistant - that doesn't work either.
I wish to have TWRP, then my situation would be much easier regarding flashing/reflashing the phone.
Any other suggestions which could be helpful to crack this nut?
Appreciate your help.

---

does fastboot work for other device?

---

i did xiaomi mi9T last time on same ADB and worked well. I was able to put TWRP on it.
Today I tried again adb on mine (phone from thread), and still console doesn't see it.
After command 'adb devices' there is long long nothing, followed console comes back to first line, without giving back any connected devices...
something else came to my mind, byt I;m not able to verify it, due to fact I need this phone. If i put on global software, and when configure it back to what I wanted i restored copy of the device from cloud, which was done on custom ROM. Could that have any potential effect on this? Whole my problem started when I installed new update of custom ROM. then lost USB, started different things and voila, I'm here...

---

please don't mix up adb with fastboot. these are two different modes with different drivers. adb works only with usb-debugging enabled, fastboot only works while phone is in fastboot mode (oem unlocking may required, but no usb-debugging). regardless of what was previously working, you should double check fastboot with other device now. this will break down the issue is related to your pc or phone. found old post for solving fastboot driver problems fastboot.reg
you can check if adb sideload is working in stock recovery (and here again, you need to wait for the drivers installed, as in every new mode for the first time). connecting two times and adb kill-server is helpful sometimes. use usb 2.0 port only and open device manager to make sure you can see the device
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
yes, unclean rollback/ mixed up ROM/firmware can cause this. but assuming such a software problem, it will only affect to mtp/adb but not to fastboot mode
without fastboot you are left with OTG for now, not much you can do

---

Hi, I was able to manage few tests. PC, ADB and cable work with other devices.
On the one with problem, I've done again full wipe, then checked if Pc sees it, but no success. Then I brought back copy of the device from cloud and nothing. Still phone doesn't see the PC, so PC the Phone. Again, when phone is plugged to PC, there is only chime it has happened, and charging starts. Changing different types of USB function in dev options doesn't make any difference.
I'm not bale to load different software even via OTG, as I don't have option in update menu, to select zip package from drive location....
Any ideas what to try/do next ?

---

use the working phone to track down which usb controller in device manager is related to the physical usb port (hierarchical view like screenshot above) if your phone is in fastboot mode but not visible, but the working phone is, the problem is electrical contact (otherwise you should see something regardless of the driver is installed or not)

---

Dear marian85-85, did you finaly founded a solution ?
I received my new one with Miui 12.02 already upgraded and I get the same issue on OTG, it's only charging and no USB-OTG detected
Tried with all USB setting ON, with developer activated. No phone device recognized on computer (1 linux and 3 windows). 3 differents cables working on another phone, restore factory, MI-Suite... I think Miui 12. can block usb data..
Any news next ?