firmwaretool: 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/sbin/firmwaretool - from package: firmware-tools

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

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