Errors

use_warnings

Net::TFTP

valid_signature

Old SIGNATURE detected. Please inform the module author to regenerate SIGNATURE using Module::Signature version 0.82 or newer.
gpg: Signature made Sat 25 Feb 2017 09:39:24 AM JST
gpg:                using RSA key 5D1AC122F3AA334D
gpg: Can't check signature: No public key
==> BAD/TAMPERED signature detected! <==