serve_image: 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/sbin/serve_image - from package: mtd-utils

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

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