lm4flash: 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/lm4flash - from package: lm4flash

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

Error in other languages:
lm4flash: bevel nie gevind nie
lm4flash: comandă negăsită
lm4flash: comando não encontrado
lm4flash: commande introuvable
lm4flash: command not found
lm4flash: käsku ei ole
lm4flash: không tìm thấy lệnh
lm4flash: komanda nerasta
lm4flash: Kommando nicht gefunden.
lm4flash: kommandot finns inte
lm4flash: komut yok
lm4flash: nie znaleziono polecenia
lm4flash: níor aimsíodh an t-ordú
lm4flash: no se encontró la orden
lm4flash: no s'ha trobat l'ordre
lm4flash: opdracht niet gevonden
lm4flash: parancs nem található
lm4flash: perintah tidak ditemukan
lm4flash: príkaz nenájdený
lm4flash: příkaz nenalezen
lm4flash: команда не найдена
lm4flash: командата не е открита
lm4flash: 命令找不到
lm4flash: コマンドが見つかりません