sunxi-usb-boot: 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/sunxi-usb-boot - from package: sunxi-tools

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

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