[LeEco Le Pro3 Questions & Answers] tsongming:
Your phone is not bricked. ( It it was you would not be able to access Fast boot or recovery)

When you connect the OTG drive, Don't forget to click install and then select the drive.

If it does not see it reformat the flash drive on your desktop computer to Fat 32 add your Rom, Gapps and magisk.

If it still does not see it try another flash drive or use the All in One tool.

TOOL ALL IN ONE

If your device not recognized is a usb driver issue, and You will need to reinstall the Google USB driver, and while you are at it check to make sure adb is up to date.

Easy Way to do this with one tool

[MENTION=4712355]mauronofrio[/MENTION] built an excellent tool for keeping your drivers and adb up to date. Plus it will give ADB system wide privileges.

Mauronofrio's tool is called: "TOOL ALL IN ONE"" and it's great,

After you install it, make sure to check for updates.

Get it here:*https://toolaio.tk**

XDA Main Page:*https://xdaforums.com/le-pro3/development/tool-tool-one-mauronofrio-t3580611

* The all is one tool is excellent and you can use it to install everything you want.

* You can use it to unlock the bootloader.

* Install TWRP,

* Fast your Rom, Gapps and Magisk etc.

* The tool will also update your existing installation of ADB, Android Drivers, and provide system wide ADB privileges.

Since you are having issues I would recommend that you flash lineage 15.1 - It is highly stable and is Caf based.

Make sure that you are using a current version of TWRP and you are rooted. be in the habit of alway rebooting to recovery before rebooting to system. Make sure TWRP stay installed overtime you flash a Rom by checking boxes to check for TWRP install. Otherwise you will be bricked.

This issue sound like you are just boot-looping or you have a soft brick .

You should first try to do a factory reset from the Wipe menu. Then if you can get the OTG drive working, use the all in one tool, or just send the files to the phones storage using Windows explorer.

If you end up with a encrypted storage issue

To format the storage*

Go to Wipe, choose Format Data and follow the instructions.*

This will erase all of photos , music, etc

If you wiped your data partition, you'll need to push the zip file to the newly formatted storage. -*This is one BIG reason why using OTG is better.*You can use Mauronofrio's "TOOL ALL IN ONE"" for pushing the ROM, Gapps, and Magisk to storage.

Root: You absolutely should root!

You will need to wipe storage>Advanced wipe select everything except for your usb drive ( Note this will erase your storage and any files you have on storage)

Reboot to recovery > Install> RoM, Gapps, Magisk > reboot to recovery> reboot to system

If you still have issues, let me know. I am certain that you do not have a brick, it is possible that you USB card in the phone is going bad. but I doubt it.

Finally, get rid of the factory usb cable and replace it with a high quality cable. The stock cable has been known to fry the usb card. and some people go ahead and replace the cable and charger altogether.

I would recommend Anker or this one by google: https://www.amazon.com/Google-Origi...8064&sr=1-22&keywords=USB+Type+C+Wall+Charger