mknbi-rom: 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 Debian possible default full paths are:

/usr/bin/mknbi-rom - from package: mknbi

You may install the required package with command apt-get install {package}

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