[LeEco Le Pro3 Questions & Answers] tsongming:
You battery is not necessarily dead, you phone is just hard bricked, the symptoms you are having is exactly what happened to a friends phone and we were able to revive it. Just following the steps in the unbrick guide. https://xdaforums.com/le-pro3/how-to/guide-unbrick-le-pro3-tested-t3622340 If you check the last post you will see that someone just recently unbricked their phone.

Worst case there are services for repairing a bricked phone:

I have attached my notes below: The information came from multiple post by various people and my own research combined. Its unedited, I had planned on posting a more polished guide. So I am just copy pasting what I have so far. But the methods listed definitely works unless you do in fact have a hardware issue.

This Thread dedicated to unbricking The Leeco variants X720 and X727

These instructions may not work if you flashed with wrong firmware and you are stuck in Qualcomm Mode 9008.

* I plan to create a post that will share these thorough instructions with the public.

* After spending over an hour typing all of this out for you. I found this video that you can use a companion tutorial to walk your through the steps visually. https://www.youtube.com/watch?v=iN9Ce3hKlRA

* While there are s a couple of differences. For example, The person in the video is flashing a different phone.Most of the steps are the same.

https://xdaforums.com/le-pro3/how-to/guide-unbrick-le-pro3-tested-t3622340

1. Download Flash 2( Tool) here: https://mega.nz/#!ex5nmQxB!qXLIg3wpeQwuiTShdOz_DEStXFiKUPfSoXNLjomn4ag

2. Download the Qfil file for Lex Pro 3 file here: https://mega.nz/#!BJ52CApB!8lFCesula...e=DonanimHaber

3. Make sure you place and run this file from the root of your PC I.E : C:/

4. Do not unzip, when selecting it needs to stay a zip file

5. Keep these files. In case you ever need them again and if it works for you.

Instructions

* QFIL mode: Press on vol+ and vol- simultaneously while holding power

* Alternate way to get into edit mode ( Press vol+ and vol- while plugging usb into pc. enter in edl mode.

* Then start flash one

* Advance option Get HSCT

* Flash Type: Flash dead phone

* To Flash Developer Rom: rename of rom to 1.zip

* After completing the flash press and hold the power-button down for 30+ seconds and the phone will vibrate

* Release the power-button, it will vibrate again after 10-20 seconds*

After you have performed all of the steps

* Your Le Pro 3 will have the temporary repair version of EUI.

* The phone may not boot automatically.

* Press and hold the Power Button for two minutes or longer.

* iIt will leave the QFIL Mode, and will vibrate continuously for 20 seconds or longer.

* The phone could take as long as 15 minutes to start.

* Immediately you will notice that part of your storage is missing.

*

* Restore the storage back to default by going to Backup/Restore in Settings and Factory Resetting the Phone with the "Format Virtual SD Card" Option selected.

* *Next install the latest Official EUI download EUI 21S ( do mot load anything above this)

* Rename the file to Update.zip and place on OTG drive or into phone storage using file manager.

* Go to check for update and click hamburger icon in top corner and select you Update.zip file to upgrade

* If it doesn’t work retry steps,, If you have an issue from here let me know, also let me know if it works.

Worst Case after restoration attempt to resolve size issue.

* if you still have a problem install Twrp and Flash via TWRP install.,

* Wipe EVERYTHING... and flash the ROM using a usb Flash Drive and after mounting USB OTG Storage.*

* To Flash TWRP simply shut down the phone and By Keeping the Volume Down Button Pressed Hit the Power Button to Enter the Fastboot Mode.*

* flash TWRP Recovery...

* Boot into TWRP Recovery...

* Restart TWRP Recovery... I

* insert the USB Flash Drive

* Using USB OTG Adapter... and flash the ROM using the Install Tab in TWRP Recovery.

Addendum:

As far as I know the X725, has the exact hardware requirements as the X720 and X727 and many parts suppliers list hardware components being compatible with all three devices.*

Have you tried removing and reinstalling Qualcomm drivers, turning off firewall and antivirus, reinstalling and rebooting? Sometimes the most basic steps are the solution.

Here is a link that might provide additional things to try:*http://www.androidbrick.com/unbrick-...usb_dload_edl/

Stock Rom and drivers can be found here:*https://devsjournal.com/download-let..._Pro_Stock_ROM

I will look around and see if I can help you find anything else that may be useful.

BTW, the X720 and X727 are pretty much the same phone so it doesn't matter, it can be easily fixed. At this most my X727 thinks its a X720 because I just flashed a newly released X720 test Rom.*

Here is a link to a Stock Rom that will not ask for a key and the drivers can be found here as well.*https://devsjournal.com/download-let..._Pro_Stock_ROM*( This should definitely work I know that several people have used this file recently with success)

I will look around and see if I can help you find anything else that may be useful.

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Addendum:

Re: Instructions for unbricking your phone

Okay so you were able to download the files but Windows is not recognizing the file. Okay, I read the message in the middle of being focused on something else and misunderstood,thinking that you couldn't download it.*

So It seems that Windows has damaged the file or Qfil installation.

1. Do you have more then one copy of the file? Here is an alternative copy:*https://androidfilehost.com/?w=files&flid=244213

2. You will need to uninstall and reinstall Qfil

If you are on Windows 10, you will need to turn off antivirus, and all the block-ware that Microsoft has installed within Defender which may delete files or neuter files that it doesn't like. Perhaps this is what happened to your Qfil installation? ( I have a new laptop and dealt with this issue recently attempting to install Viper Audio mods for PC) So unfortunately, you may also need to uninstall and reinstall Qfil, ensure that you install as admin.

Go through your settings and make sure under apps >>apps and features>> the dropdown box installing apps and turn off installing apps from store only.

Go to Apps & features in Settings.

Under “Installing apps,” there is a drop-down menu with three options: make sure “Allow apps from anywhere” is on.

Although the Qfil tool is used universally to repair all Qualcomm boards. Windows 10 may cause issue and disable functions that allow root level changes to your attached device. Yes, this will flag Windows Defender

Defender

* Open Windows Defender Security Center from your Start menu, desktop, or task-bar.

* Click on the App and browser control button on the left side of the window.

* Check Off in the Check apps and files section.

* Make sure that Defender and any other antivirus or malware blocker is turned off.

* Unfortunately, from now on you will always need to turn these things off if you are installing drivers or programs that did not come from Windows store.

* Make sure all defender settings are toggled off.

* Turn off the controlled folder access .

Worst case: Other potential ways to resolve

This sucks ( If you will never use it otherwise) but you may even need to enable developer mode

https://docs.microsoft.com/en-us/win...or-development

You can return everything back to normal after you unbrick your phone.

The link below explains how to resolve additional potential issues caused by the Microsoft OS,

https://flashfiletool.com/qualcomm-usb-driver-download*The full setup option, on this page will download all drivers ( download only if needed) for all supported phones.

Hopefully, this finally resolve it for you. I am keeping notes. So once this is resolved. We can provide some updated cohesive steps to help other people that have the same