GenFw: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/GenFw - from package: edk2-tools

You may install the required package with command yum install {package}
Error in other languages:
GenFw: bevel nie gevind nie
GenFw: comandă negăsită
GenFw: comando não encontrado
GenFw: commande introuvable
GenFw: command not found
GenFw: käsku ei ole
GenFw: không tìm thấy lệnh
GenFw: komanda nerasta
GenFw: Kommando nicht gefunden.
GenFw: kommandot finns inte
GenFw: komut yok
GenFw: nie znaleziono polecenia
GenFw: níor aimsíodh an t-ordú
GenFw: no se encontró la orden
GenFw: no s'ha trobat l'ordre
GenFw: opdracht niet gevonden
GenFw: parancs nem található
GenFw: perintah tidak ditemukan
GenFw: príkaz nenájdený
GenFw: příkaz nenalezen
GenFw: команда не найдена
GenFw: командата не е открита
GenFw: 命令找不到
GenFw: コマンドが見つかりません