How to fix "failed to connect" issue?

When you can't get your phone recognized by Toolbox, here are some suggestions for you:

1. Uninstall the current Toolbox in your computer, and install the latest version by clicking the following link:
http://download.iskysoft.com/cbs_down/android-data-recovery_full1899.exe
2. Make sure USB debugging option is enabled in your phone.

1) If your Android version is 2.3 or older than 2.3, go to Settings>Applications>Development in your phone to enable USB debugging.


2) If your Android version is 3.0 to 4.1, go to Settings>Developer Options and then enable USB debugging.



3) If your Android is 4.2 to 5.2 versions, please go to Settings>About Phone and then tap "Build Number” 7 times until “You are under developer mode” pops up.Then go back to Settings>Developer Options, there will an option for you to enable USB debugging.


4) If your Android is 6.0 and newer versions, go to Settings>About phone>Software info tap "Build Number" 7 times and then back to Settings>Developer Options>USB Debugging to turn it on.

3. Unplug and re-plug in your device to the computer, make sure computer sees your phone, then use Toolbox.

4. Unplug all the other USB devices attached to your computer, because some devices may effect the USB connection with Toolbox.

5. Install the latest version of driver of your device in your computer.

For your reference, this link will allow you to find the correct driver for your specific device: http://developer.android.com/sdk/oem-usb.html 

Brand	Driver URL
Acer	http://www.acer.com/worldwide/support/mobile.html
alcatel one touch	http://www.alcatelonetouch.com/global-en/support/download.html
Asus	http://drivers.softpedia.com/get/MOBILES/ASUS/
Dell	http://www.dell.com/support/drivers/DriversHome?c=us&l=en&s=dhs
Fujitsu	http://www.fmworld.net/product/phone/sp/android/develop/
Fujitsu Toshiba	http://www.fmworld.net/product/phone/sp/android/develop/
Garmin-Asus	https://www.garminasus.com/en_US/support/pcsync/
Hisense	http://app.hismarttv.com/dss/resourcecontent.do?method=viewResourceDetail&resourceId=16&type=5
HTC	http://www.htc.com/us/  Click on the support tab to select your products/device. Different regions will have different links.
Huawei	http://www.huaweidevice.com/worldwide/downloadCenter.do?method=index
Intel	http://corpredirect.intel.com/Redirector/404Redirector.aspx?404;http://www.intel.com:80/software/android
KT Tech	http://www.kttech.co.kr/cscenter/download05.asp for EV-S100 (Take)
Kyocera	http://www.kyocera-wireless.com/support/phone_drivers.htm
Lenevo	http://developer.lenovomm.com/developer/download.jsp
LG	http://www.lg.com/us/support/mobile-devices/phone-support
Motorola	http://developer.motorola.com/docstools/USB_Drivers/
Pantech	http://www.givemefile.net/drivers/mobile_phones/pantech.html
Pegatron	http://www.pegatroncorp.com/download/New_Duke_PC_Driver_0705.zip (ZIP download)
Samsung	http://www.samsung.com/us/support/downloads
Sharp	http://k-tai.sharp.co.jp/support/
SK Telesys	http://www.sk-w.com/service/wDownload/wDownload.jsp
Sony Ericsson	http://developer.sonyericsson.com/wportal/devworld/search-downloads/driver?cc=gb&lc=en
Teleepoch	http://www.teleepoch.com/android.html
YulongCoolpad	http://www.yulong.com/product/product/product/downloadList.html#downListUL
ZTE	http://support.zte.com.cn/support/news/NewsDetail.aspx?newsId=1000442
Google Nexus	http://developer.android.com/sdk/win-usb.html

If this still doesn't help, please use the feedback button on the upper right corner of Toolbox to let us know about the problem, we will get back to you.