1. FunkyHuawei credit or pass.
2. Windows PC
3. Bootloader code from unlockhuawei.com
1. Use the 'new HiSuite method' to install from the Misc section, version EVR-L29 220.127.116.11
(These instructions: https://pastebin.com/raw/Db5ZSyqu )
2. Now you can enable "OEM Unlock" from the developer options. (It wasn't possible without step 1)
3. Reboot to fastboot mode, use fastboot command:
fastboot oem unlock CODE
(replace CODE with your code)
Now the bootloader is unlocked! Time for development!