[LeEco Le Max 2 Guides, News, & Discussion] alap1983:
The final steps to Remove "Vendor ROM" that does not have the Update Option in Settings Or Unbrick Le Max 2 or simply Update Le Max 2 to latest EUI.

NOTE: This method should address the following weird problems:

1. Le Max 2 TWRP Seeing 0MB in Internal Storage. Unable to access the ROM Storage

2. Encrypt Option Greyed Out In Settings-->Fingerprint and Security

2. Update Option missing in Settings.

3. Fingerprint Sensor not working... If it still gives trouble... Calibrate the FP Sensor in its settings. Or register the same fingerprint multiple times.

This method should work on ALL versions of Le Max 2 including X820 X829 X821

Before starting... Remove ALL USB peripherals that might interfere with the process. Use USB Ports on the PC/Laptop... DO NOT use USB Hubs... Even if the phone appears dead... Connect it Power Outlet and let it charge for an hour.

1. Download the latest Stable EUI... from LeEco Website Directly .

2. Download the FlashOne v1.9 And Service ROM From HERE.

UPDATE: FlashOne v2.0 has been released! Here's the LINK.. It is a bit more advanced and offers the ability to format User Data for a Cleaner Flash

3. Download Qualcomm Drivers

4. Put Le Max 2 in EDL (Emergency Download Mode) by pressing Volume +, Volume - and Power Button Simultaneously. For those having difficulty..... Here are few tips.

Connect the Phone to PC. If the phone is Switched/Powered On... Then Power Off the phone and Switch Back On with the Key Combinations.

OR

If the Phone is Switched Off... Then Use the Key Combination to put the phone in EDL Mode..

In either case..... the PC will make a sound of Disconnection and Reconnection of an USB peripheral. AND you will see Qualcomm QDLoader 9008 Driver Installation. To verify the same... go to Device Manager in Win 7 / Win 10 and Under Ports (Com & LPT)... you should see Qualcomm HS-USB QDLoader 9008 (COMXX).. The XX corresponds to a particular COM Port. Remember this port.

5. Once the Le Max 2 is in Qualcomm QDLoader 9008 EDL Mode... Start the FlashOne Software.

6. Choose “Qualcomm – flash dead phone” from the drop down menu next to “Flash type”.

7. Click “Refresh button” next to “Select Device”. Here your Le Max 2 will show up but in COM Number (ComXX)

8. Browse for our Qfil/service ROM by clicking “Select File”.... You can technically select the Latest EUI ROM... But it is safer with Service ROM. DO NOT Unzip the ROM File.

9. After everything is set up under “Settings”, Press “Flash” button.

10. Installation can take anywhere between 10 to 20 minutes. Have Patience.

There are chances that the Flashing might fail. In case it does... Simply put the phone in EDL Mode again... and restart the procedure.

11. After the FlashOne confirms successful flash... Wait for 15 - 20 seconds. Then Power On the phone by pressing the Power Button for at least 60 seconds. Do Not Panic due to the long press.. Press it until the phone vibrates.

12. The Le Max 2 should be in Developer Version of EUI with an unlocked Bootloader and STOCK recovery.

13. The Developer ROM has the “Format Virtual SD card” setting in Settings Menu--> Backup/Reset--> Factory Reset.. Use the setting to get back the 50+GB

[You can also use the option Format Data in TWRP Recovery instead and the partition will 64GB correctly instead of 10 GB initially. Read ahead for the procedure]

14. Once you have a working Le Max 2... there are two directions:

Install Latest Stable EUI ROM... with Update Option

OR Install TWRP Recovery / ROOT / Custom ROM

15. a. For those who wish to install Stock ROM... Simply rename it to "update" (DO NOT Add .zip... Else the file will look like update.zip.zip) and place the update.zip file in ROOT of the phone. Thereafter Switch Off the Phone... Enter Recovery by pressing Volume + and Power Button... Choose Update System AND the other setting to Clear All Data. Your Le Max 2 should update without any error.

15. b. For those who want TWRP and ROOT:

* Download the latest TWRP (For Le Max 2) and SuperSU from their respective websites. Download and Install ADB and Fastboot From HERE.

* Copy the SuperSU Zip File to the ROOT of the Phone.

* Unzip and Rename the TWRP recovery to Recovery (The file should be Recovery.img.... NOT Recovery.img.img)

* Put the Le Max 2 into Fastboot Mode By Pressing Volume - and Power Button

* Go to the ADB Install Folder and Press Shift & Right Click to get & select “Open command window here“. Confirm Fastboot is working by Entering Command: Fastboot Devices.. You should see a random string of letters followed by the word Fastboot. If you do not see the same..... the installation didn't complete successfully.

* In the Command Window.. Type: fastboot flash recovery recovery.img

* Enter the following Command: fastboot boot recovery.img

* Once the Phone has entered the Recovery... Flash the SuperSU Zip file and you will have ROOT capabilities.

* Take FULL Backup of your device and then install ANY Custom ROM.

Do let me know your results.

[Update]: There's a simple method you could try to get the Update Option Back in Le Max 2 Phone that arrived with Vendor ROM... Using the default File Manager Tap on the Update.zip file and select Upgrade Option. This will force the phone to Update using the ROM file. This method is for people who could not update through the Stock Recovery and received Errors.