[LeEco Le Pro3 Questions & Answers] tsongming:
So you completely all steps with error. But the phone will not start? Take another look at the steps ( that is expected) It takes a while to start. Can you now see the phone storage from your PC?

Is it possible to send files to the phone via fastboot?

If so, you may be able to flash a recovery, and root your phone using aDB bridge or restore stock EUI.

Keep in Mind that Un-bricking your phone will be frustrating and will require alot of trial and error.

I have been there and since I had some extra time I decided spent a little more than an hour writing you a whole new guide with working links. Just remember that you can definitely unbrick your phone.

Directly from Leeco Website : When it was still accessible

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1. Download the QPST tool & driver.

2. Make sure your device has the Power to support flashing.

3. Run Flash and QFIL

Downloads : ( These downloads take a few minutes but works and comes directly from Leeco)

FlashOne1.9 : https://pan.baidu.com/s/1nvttJtf

9008 Driver: https://pan.baidu.com/s/1nvdKHeT Download and install Qualcomm driver. While installing driver avoid using cable for successful installation.

QPST.2.7.460.zip https://easy-firmware.com/home/browse/file/id/102719/QPST.2.7.460.zip/

Flash File: zl1_qfil (1).zip

After installation, connect Phone to PC using USB cable.

* While connecting to PC, phone should be switched off and press volume up & down as boot key.

* If it makes Qualcomm port, then driver has been successfully installed.

If the right Qualcomm driver is installed on your computer

You should see the phone as a Qualcomm HS-USB QLoader 9008 or incorrectly listed as Qualcomm HS-USB Diagnostics 900E both within settings and device manager. )IF your device is showing Qualcomm HS-USB diagnostics 900E(COM4) , then you are not in the correct Qualcomm mode.

When device shows Qualcomm HS USB 9008 then use flash 2.0 to flash your ROM

Fastboot: Press and hold the power button and the volume down (minus) to enter fastboot mode.

Recovery: Press and hold the power button and the volume up (plus) to enter Recovery mode.

QFIL upgrade mode: Press and hold the power key and the volume up and down key ( at same time!) to enter “Qualcomm FIL “Mode!* Again: Qualcomm mode, You need to press all 3 buttons V+,V-, + power buttons simultaneously after connecting to usb!

* Run the Minimal ADB and Fastboot From the Start Menu

* Use the following command to check if your Device is Detected in ADB:

adb devices -l

For additional things to try see : https://developer.android.com/studio/command-line/adb.html

* In Flash 2.0 select your file then click Refresh you should see the port COM + and then select File Select QFIL upgrade package, the package release address

Review installation steps here before starting : https://xdaforums.com/le-pro3/how-to/guide-unbrick-le-pro3-tested-t3622340

Note all of the links are dead. But the images are relevant and you have the files from the links above.

I am not fully clear on exactly where your are having the issue. Send me the log files from flash 2.0

You do not need to use 9 different roms. Just uses the files included with the link. These steps WILL NOT work on any other phone other than the X720 and X727. If you have something besides a X727*or X720 then theses steps are not going to help you.

Make sure that you installed the Qualcomm 9008 drivers on your PC

ADB has to be authorized on Windows 10 for this to work, You can update ADB and Android drivers on your computer by using

Apparently, this http://en.miui.com/thread-266598-1-1.html

It is completely possible that you have a hardware issue. Such as a damaged USB card, usually caused by a faulty usb cable ( the usb cable that come with the phone have been known to have quality issues.) If you purchased the phone recently, I would suggest that you contact the vendor that you purchased the phone from and request a warranty exchange.