I'm going to cry. :crying:
Yes, I have LeEco Le Pro 3 Elite X722. Just bought it from Banggood.
I did download this one and other ones to test them.
They all didn't work.
The only version that worked was TWRP 3.1.1 for X722.
However, I think I softbricked my phone now, because it's stuck on AICP logo. (it changes colors but the system just don't start after waiting for 10+ minutes)
My options : I can still go on Fastboot mode but not in recovery mode.
How I did it :
I installed/downgraded/upgrade via recovery 01D provided in the thread and then, tried to make my pc detect my phone.
When it finally did after 3 hours of despair, I discovered my phone was already unlocked.
So, I tried to make TWRP 3.2.1 work, but no success until I tried 3.1.1.
I "format data" (because I didn't know what button I needed to press),
I installed ROM (AICP Weekly zl1), GApps (ARM64, Android 8.0, Nano pack) and Magisk. (It already had Google Play but someone told me to install it anyway...)
Finally, I wiped data one more time before rebooting system.
Tada, stuck on AICP logo forever.
:crying::crying: