Yifan Lu and madmonkey1907 managed to dump the PlayStation Classic MTK boot ROM via serial interface and then realized the key Sony used to encrypt areas of the system was the shared public key as opposed to using a private key kept secret as it should be in this case. In other words Sony failed to secure the device by mistakes in the encryption signing process, and it's not the first time that happens. You can use this search to find the related releases so far in the download section for this hack. News spread around quickly on Twitter so mainstream outlets like arstechnica.com and hackaday.com picked up the story. Thanks goes to GaryOPA for letting me know about the BleemSync tool.