Yes, I realized, I had edited the post seconds before your comment

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if [ ! -f runme.sh.sig ]; then
echo "Cannot Find Signature!!!" >> /tmp/upgrade_result
else
openssl dgst -sha256 -verify /etc/bitmain-pub.pem -signature runme.sh.sig runme.sh >/dev/null 2>&1
res=$?
if [ $res -eq 1 ]; then
echo "Installer Not Signtured!!!" >> /tmp/upgrade_result
else
if [ -f runme.sh ]; then
sh runme.sh
else
echo "Incorrect firmware!!!!" >> /tmp/upgrade_result
fi
fi
fi
#if [ -f runme.sh ]; then
# sh runme.sh
#else
# echo "Incorrect firmware!!!!" >> /tmp/upgrade_result
#fi
Fine, I already have the code, what's next?