[j-nsp] Password recovery?

[Jonas Frey (Probe Networks)]

Hello everyone,

ive got a small problem regarding a M5 here.
Someone lost its password (console and config).
I've tried the well-known password recovery mode using single user mode
and /usr/libexec/ui/recovery-mode, however it says that it cant find
that file then. Its running JunOS 5.1R1.4.
Any ideas?

Regards,
Jonas