adb: how to successfully boot the bootloader / fastboot mode on the Alcatel 5049z smartphone

I'm having problems (I'm a "newbie" when it comes to unlocking the Android a30 bootloader with a PC …) with boot in bootloader / fastboot mode in my stock rom – android 7 – Alcatel a30 (5049z not rooted?) Smartphone; I tried the power button sequence / volume button method … there was no luck there, and I tried the adb method using: ADB bootloader / fastboot … I'm not lucky !!!

I would like to know if any forum member knows how to unlock my a30 boot loader without (is it possible?) Restart in the boot loader modes mentioned above or if this phone is unlockable with the boot loader without removing the FRP ( Factory Reset Protection)?

Thanks in advance for any useful answer!