> For the complete documentation index, see [llms.txt](https://doc.some3c.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.some3c.com/panda-manual/connection-faq.md).
# Connection FAQ
## 1.Xiaomi Redmi is out of control?
Xiaomi Redmi series phones need to turn on \[USB debugging] \[USB installation] \[USB debugging security settings] to control
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## 2.VIVO phone cannot be controlled?
VIVO series phones need to turn on \[USB debugging] \[USB simulated click] settings to control
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And turn on "USB Safety Permissions", then you enable USB debugging successfully
## 3.Huawei Honor phone cannot be recognized?
Huawei or Honor phones need to download the corresponding mobile assistant on their official websites (ignore for other brands of phones)
Huawei Mobile Assistant: ;
Honor Mobile Assistant:
1. Install the mobile assistant on your computer
2. Use a USB data cable to successfully connect the phone and assistant (the mobile assistant has a connection tutorial)
3. The assistant will push the Huawei or Honor mobile phone driver to the phone, click to install
4. After the driver is successfully installed, turn off the mobile assistant and re-plug the USB cable
5. If it still doesn't work, try restarting the phone
## 4. Computer Problems
### 1. What is the upper limit of device connection? Panda Android Mirror Screen Casting Software itself has no limit on the number of connected mobile phones. The number of connected devices is determined by the user's computer motherboard or router.
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USB connection mode
1. Theoretically, the motherboard of an ordinary home computer host supports a maximum of 127 USB connections, but most motherboard manufacturers limit the number of USB connections to 40. Therefore, under normal circumstances, a home computer host can only connect to 40 devices.
2. The motherboard of a commercial server usually adopts the X79 or X99 architecture, which has no limit on the number of USB connections and can be unlimited in theory.
OTG or WIFI connection mode
1. If you use network connection modes such as OTG or WIFI, the number of connections is not limited by the computer motherboard, so there is no need to consider the problem of the computer motherboard. But it is limited by the performance of the router.
2. Usually, home routers can only support up to 20 devices for stable use, and more will cause frequent disconnection. Enterprise routers can usually support up to 40 devices for stable use, and more will cause frequent disconnection.
3. The most cost-effective router solution is soft routing. In theory, a soft routing device can support hundreds of devices for stable use at the same time. Of course, the premise is that your bandwidth must be sufficient. If the upstream and downstream speeds of the bandwidth are not enough, it will still be stuck.
### 2. What if the device cannot be detected?
First, check whether the computer (open this computer) recognizes the device. If the computer does not recognize the device, the software cannot recognize it, so you need to find the problem with the computer. If there is a device in the computer and the software cannot recognize it, there are probably the following reasons Cause analysis:
1. The mobile phone USB debugging switch is not turned on;
2. The device has not installed the mobile phone driver;
3. Adb conflict, there are multiple different versions of Adb.exe files in the system. Solution:
4. Check USB debugging in the mobile phone developer options.
5. Refer to the mobile phone driver installation problem to install the driver.
6. Refer to the Adb conflict resolution method.
### 3. What to do if USB controller resources are insufficient?
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First turn off the \[XHCI] item under \[USB] in \[BIOS], then try to change the USB port of the computer, and finally try to use a specific USB expansion card. If some motherboards have extra card slots, you can buy a USB expansion card. One expansion card can carry about 15 devices. It depends on the computer motherboard.
### 4.What should I do if the Panda device is detected and it says it is not authorized?
1. Find a merchant to obtain the adb authorization file (adbkey, adbkey.pub),
2. Put these two files in the C:\Users\Administrator.android folder, overwrite them, and then restart the computer.
## 5.How to check device status using the device list?
Click on the panel "Devices" to view the status of all devices.
## 6.What should I do if it prompts that the device is disconnected from the server?
{% hint style="info" %} **Common reasons**
The user's local computer has incorrect time or time zone, which will cause disconnection with the server
**Uncommon reasons**
The user has opened a VPN, which causes the connection delay with Panda to be too high.
The user has opened a proxy server in the computer settings.
The user has opened a packet capture tool, which causes Panda to fail to connect.
**Solution**
1.Change the computer local time to the current time\
2.Exit VPN, IP proxy tool, and then restart Panda,\
3.Exit the packet capture tool (such as Wireshark, Fiddler, etc.)\
4.Reconnect your computer to the Internet.
{% endhint %}
## 7.What should I do if the screen goes black or the connection is disconnected when using a certain type of app?
{% hint style="info" %}
Problem
1. The phone screen goes black when paying
2. The phone screen goes black when entering the password
Reason
1. The phone system's security protection mechanism for sensitive interfaces.
{% endhint %}
> Operation steps
>
> 1. Manually turn off input protection: Phone's built-in settings ---- Input method settings ---- Secure keyboard/Secure input
> 2. Manually turn off payment protection: Phone's built-in settings ---- Payment protection
> 3. Unsolvable situations
> 4. Android 11 or Hongmeng 2 and above versions cannot be solved for the time being due to security restrictions of the phone system.
## 8.What to do if there is a delay between the mobile phone screen and the computer screen?
### 1.Try reducing the frame rate of the small screen to the minimum
### 2.Check whether the \[Random Delay] switch is turned on. If it is turned on, please turn it off.
### 3.Check whether the \[Synchronization Delay] switch is turned on. If it is turned on, turn it off.
### 4.It is recommended to replace a computer with a higher configuration. The more CPU cores there are, the smoother the operation will be. It is recommended to try to update the data cable. The data transmission rate of the data cable may be too low.
## 9.Panda crashes Continuous Exit
### 1.Close panda open the computer C:\Users\Administrator (your account name) directory and delete the ".updateFiles" folder
### 2. Panda pause loading
Uninstall the Panda software, and open the computer "C:\Users\Administrator (your account name)\AppData\Local" Delete the "xiaowei" folder, and then reinstall the Panda.
{% hint style="warning" %}
"AppData" is a hidden folder. Search Google for how to show hidden folders.
{% endhint %}
## 10.What should I do if my computer fails to automatically recognize my phone after booting up or suddenly disconnects?
### 1.USB Selective Suspension: The system may be shutting down power to the USB ports to save power.
Open Control Panel > Power Options. Select your current power plan, click Change plan settings > Change advanced power settings. Expand USB settings, and disable USB selective pause. Save the settings and restart your computer.
### 2.USB Sleep Power Supply: Some motherboards completely disconnect power to USB ports after shutdown.
\*Restart your computer and enter the BIOS/UEFI settings (press Del/F2 or other keys during startup). The method to open the BIOS varies depending on the motherboard; please search on Google.\
\*Look for options like "USB Power Delivery in Sleep Mode" or "ErP Ready" and make sure they are enabled.\
\*Save settings and exit
## 11.Encountering "USB Resources Exceeded" or "USB device has been disabled" errors in macOS
* Reduce system load (quickest fix)
* • Disconnect all unnecessary devices: Keep only the keyboard, mouse, and the USB device currently most critical for use.
* • Avoid daisy-chaining too many devices through a single external hub: This is especially important for high-bandwidth or high-power devices (such as portable hard drives, capture cards, audio interfaces, etc.).
* Resolve insufficient power supply issues Mac USB ports have limited current output. Connecting multiple bus-powered portable hard drives or high-power peripherals can trigger power protection mechanisms: • Use a powered USB hub (one with its own external power supply): This is the best solution for resource limitations caused by insufficient power.
* Connect external hard drives to an independent power source: If the external drive supports an external power adapter, be sure to plug it in.
* Connect directly to the Mac: Try plugging high-power devices directly into the Mac's Thunderbolt/USB-C ports instead of routing them through a docking station.
* Resolve "Endpoint" limitations (resource constraints) Intel and Apple Silicon (M1/M2/M3) chips impose limits on the number of "endpoints" that can be allocated to each USB controller (some devices may appear as a single unit but consume dozens of endpoints at the system level, such as complex audio interfaces or multifunction docking stations):
* • Switch ports: Different physical ports on the Mac may belong to separate internal USB controllers. Moving a device from a left-side port to a right-side port, or from the back to the front, can help distribute the resource load on the controllers.
* Downgrade to a USB 2.0 connection: If certain devices (like mice, keyboards, or receivers) do not require high bandwidth, connect them using a USB 2.0 cable or hub. USB 2.0 typically consumes far fewer system resources (endpoints) than USB 3.0.
* Reset underlying system hardware (Intel-based Macs only) For older Intel-based Macs, you can reset hardware management to clear incorrect resource allocation states (this procedure is neither necessary nor possible on Apple Silicon Macs):
* Reset SMC (System Management Controller): Controls power management and USB port power delivery.
* Method: Shut down the Mac, then press and hold Shift + Control + Option and the power button simultaneously for 10 seconds; release them and turn the Mac back on.
* Reset NVRAM/PRAM: Clears the hardware configuration cache.
* Method: Shut down the Mac, then immediately press and hold Command + Option + P + R upon turning it on; release the keys only after hearing the startup chime twice or seeing the Apple logo appear twice.
