simg_dump: 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/simg_dump - from package: android-tools-fsutils

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

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