With EMUI 10 and newer (Android 10+), Huawei introduced Android Verified Boot (AVB) 2.0 and hardware keystores (TEE). This makes it impossible to unlock the bootloader without physically exploiting the device (e.g., test points, shorting pins, or using an special EDL cable).
Huawei uses an algorithm to generate Network Control Keys (NCK)—commonly known as unlock codes—based on your phone's unique IMEI number. Over the years, Huawei changed its algorithm. This is where the versioning comes in: download huawei v4 and v5 unlock code calculator link
Important Note: Huawei stopped supporting bootloader code unlocks via official channels in 2018. By 2020, carrier unlock code calculators stopped working for models released after mid-2018 (those with EMUI 8 or newer). If you have a Huawei P20, P30, or Mate 20, this method will not work. With EMUI 10 and newer (Android 10+), Huawei
PotatoNV is a legitimate, open-source tool that exploits a vulnerability in older Huawei bootroms. It works for devices like: Caution: PotatoNV requires shorting a test point on
Caution: PotatoNV requires shorting a test point on the motherboard and uses a USB to UART adapter. It is not a simple "calculator."
Even if you have a v4 or v5 calculator, many Huawei devices require a server-side token from Huawei’s internal servers. Without that token, the generated code, even if mathematically correct, is rejected by the phone’s fastboot.