usbprog: 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/usbprog - from package: usbprog

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

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