I have successfully installed /e/OS 1.10-r on Teracube 2e “emerald”.
Here is my feedback.
There are two 2e versions : SN 2020 is “zirconia” and SN 2021 is “emerald”.
So, I would recommend to upgrade all documentation accordingly.
On Windows 10, I have tried to install /e/OS using latest Easy-Installer version : it doesn’t work.
It boots from bootloader mode (FASTBOOT mode…), but from then nothing is happening from Easy-Installer.
So, I have followed the manual instructions (https://doc.e.foundation/devices/emerald/install) using
“MediaTek_Preloader_USB_VCOM_Drivers_Setup_Signed.zip” drivers from Teracube.
It worked and I have realised the bootloader has not be unlocked using Easy-Installer.
So, I do not recommend the Easy-Installer method.
Also the instructions to lock again the bootlaoder are not correct :
fastboot flash preloader_a preloader_yk673v6_lwg62_64.bin
fastboot reboot => it shall be not performed and removed from documentation
After flashing /e/OS, the mobile shall not be rebooted before being locked.
Hope this will help other users.