How to Access EC2 Instance even if PEM File is Lost

# mount /dev/xvdf1 /mnt
# cp /root/.ssh/authorized_keys /mnt/root/.ssh/
# umount /mnt

Detach the secondary volume from helper instance.
Again attach the volume back to our recovery instance. Start the instance. Terminate the helper instance.

Use helper instance pem file to log into recovery instance.

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