Sammy Hajhamid, known online as pepsipu, is a Caltech undergraduate who writes about systems programming and security research. Their projects include operating systems, an assembler and a documented Switch 2 jailbreak investigation.[1]
Start with Jailbreaking the Switch 2 →
GitHub 
X Career
Hajhamid’s personal site identifies undergraduate study at Caltech and previous work at Neuralink, Trail of Bits, Zellic and OtterSec. They play capture-the-flag security competitions with DiceGang and have competed with the US Cybersecurity Team. Their independent projects include an operating system for retro games, a typed assembler and an emulator/game-console project.[1]
Contributions
Hajhamid’s Switch 2 investigation used JetKVM devices to send controller input over USB and receive screen video over HDMI, plus a physical mechanism to press the power button after crashes. This gave the coding agent a way to act and observe results on real hardware. The autonomous userland-code-execution goal failed; Hajhamid says the jailbreak itself required about two weeks of substantial effort. The resulting ns2jb is a software-only, tethered jailbreak for firmware 23.0.1. The account distinguishes the agent’s tooling assistance from the manual research that produced the exploit.[4]
Tools, writing & talks
Writing, research & talks
Start here
Jailbreaking the Switch 2pepsipu.comA first-person account of systems research, automation and the resulting tethered jailbreak.
Read the Switch 2 write-up for the investigation and tooling lessons before attempting any hardware work. The article assumes systems-programming and reverse-engineering knowledge; the reported result is tied to the specified firmware and tethered setup.
Author[4]Original source