doc_loadbios: command not found

Have You tried accessing the binary with the full path?

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/doc_loadbios - from package: mtd-utils

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