The recently bankrupt Chinese tech giant Phicomm installed a cryptographically locked backdoor on each and every one of the routers they released over the past several years. In this talk, I will show how I reverse engineered the backdoor protocol and discovered a series of zero day vulnerabilities in that protocol's implementation. I will also demonstrate a tool I developed to exploit these vulnerabilities and gain a backdoor on any Phicomm router released since 2017, including models released on the international market, and which can still be found for sale on Amazon. Since Phicomm is no longer in business, it's safe to assume that there will never be an official patch for these routers, which means that the surest path for securing these devices passes through this very backdoor.