EfiLdrImage: 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/EfiLdrImage - from package: edk2-tools

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