If you want a custom ROM, type 5 . The tool will attempt to flash TWRP via fastboot flash recovery_ramdisk twrp.img . Without an unlocked bootloader, this will fail 90% of the time. The 2018 tool relies on a specific test-point exploit here.
Huawei’s 2018 devices (those launched between January and December 2018) share a common hardware platform: the (e.g., P20 Pro) and Kirin 710/980 (early models). These chipsets have a known engineering backdoor in the BootROM. open adb huawei 2018 tool
Below is a draft blog post designed to be helpful and clear for someone looking for information on this tool. If you want a custom ROM, type 5
Once complete, the phone will factory reset and reboot. You will see a warning screen on boot: "Your device has been unlocked and can’t be trusted." This confirms success. The 2018 tool relies on a specific test-point exploit here
ADB works for apps, but it cannot flash Custom ROMs unless the bootloader is unlocked.
It can force a device into a state where it accepts commands even if it's locked.