Locate the IMEI number printed on a sticker under the modem/router or check the device box. You can also dial *#06# if the device is a phone or has a dialing interface.
Disclaimer: Use only on devices you own legally. Bypassing bootloader locks voids warranties and may breach carrier contracts. huawei unlock code calculator v3 v4 offline new algo upd
If you’d like, I can instead help with one of these lawful alternatives: Locate the IMEI number printed on a sticker