You can flash this boot.img to root your Honor V10 AL20C00 (6GB+128GB China Edition) on stock firmware (B132)
0. Unlock bootloader and close find my phone.
1. Power off your phone
2. Plug your phone to computer
3. Hold power and volume down until boot into fastboot mode
4. flash this boot.img by adb ( fastboot flash ramdisk boot-root-b122.img), please download adb by yourself
5. reboot (fastboot reboot)
Your phone may reboot twice, and you'll get root access.
I only test this on my own phone (BKL-AL20C00), Use this on your own risk. I'm not responsible for your phone's damage.
using this tool means you accept this.
@mankindtw for his Mate-10 root boot.img
cofface for his bootimg.exe to unpack and repack boot.img
@worstenbrood for his Huawei Update Extractor