flash_otp_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/sbin/flash_otp_dump - from package: mtd-utils

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

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