Fastboot (ADB) command errors

Hey guys,

I am trying to root one of those lesser knows China brand phones, but first I have to unlock the Unisoc boot (SPD) bootloader.

A friend sent me a video tutorial on how to get it done, unfortunately he uses Ubuntu as opposed to Kali (Debian) which I obviously use

The problem, I am having is whenever I run his commands I get this error: -bash: ./fastboot: Permision denied

Please see the complete command below to get a better idea:

sudo -i

sudo usermod -aG plugdev root

adb devices

adb reboot bootloader

./fastboot devices

./fastboot oem get_identifier_token

./signidentifier_unlockbootloader.sh XXXXXXXXXXXXXXXXXXXXXXXX rsa4096_vbmeta.pem signature.bin

./fastboot flashing unlock_bootloader signature.bin

./fastboot reboot

The reddened part is where the problem really starts. whenever I run any command from that halve I get : -bash: ./fastboot: Permision denied

I've found that when I remove "./" from just these two commands : ./fastboot devices and ./fastboot reboot they work perfectly...

However, I don't know what to do with the others.