Unlocking the bootloader on the HUAWEI Y9 Prime 2019 is currently difficult because Huawei officially stopped providing unlock codes in 2018. Since the official web form is no longer available, you must use third-party paid services or specialized software. HUAWEI Global Phase 1: Obtaining the Unlock Code
Since Huawei no longer provides these for free, you must use one of these third-party services: kyfyt fth Bootloader fy hatf HUAWEI Y9 Prime 2019
كيفية فتح البوت لودر (Bootloader) في هاتف HUAWEI Y9 Prime 2019 : دليل شامل Unlocking the bootloader on the HUAWEI Y9 Prime
الوضع الحالي لفتح البوت لودر في أجهزة هواوي kyfyt fth Bootloader fy hatf HUAWEI Y9 Prime 2019
A: Yes. Use fastboot oem relock CODE . This will wipe all data again.