EfiRom: command not found

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/EfiRom - from package: edk2-tools

You may install the required package with command yum install {package}

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