The HTC Desire 10 Lifestyle may not be the most popular smartphone on the market, and not even the most popular HTC device, but it has a dedicated following within the community. Recently, an official build of the TWRP custom recovery was released for the device, and XDA Senior Member sabpprook also created a guide showing how to root the phone once you have installed TWRP. This will require that you unlock the bootloader through HTC’s official channel, after which you can temporarily or permanently install TWRP. Once that is done, you can install Magisk to gain root access.
Install TWRP recovery
First of all, the phone must be bootloader unlocked, if you didn't do that please unlock the bootloader first, you can find many guide for that.HTC DEV / BOOTLOADER
And one thing, there is a switch called "OEM Unlock" in developer options menu, make it turn on or you will fail to get unlock token.
Now you have a bootloader unlocked device right?
Please download this TWRP recovery
Let phone reboot to bootloader and switch to fastboot mode then use the command to boot the recovery.
Code:
fastboot boot twrp-3.2.1-0-a56dj.img
If you want install TWRP as main recovery please use the command
Code:
fastboot flash recovery twrp-3.2.1-0-a56dj.img
Okay, If everything are work in right way, your device should be in TWRP recovery, you can do everything you want. 😁
I recommend to use Magisk to get root CLICK HERE! ✅
Source: XDA