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Hardware Newbie Question

Xbox One "Bliss Hack" Open-Source Modchip in Development by GFL_Tech

RainReach · 2026-06-10T21:48:05+00:00

Hey everyone, As many of you saw at the RE//verse conference, researcher Markus "doom" Gaasedelen blew the Xbox One’s security wide open with the "Bliss" exploit—a hardware-level Voltage Glitch Hack (VGH) targeting the secure boot ROM. Because this attack exploits physical silicon behavior during early boot, it is completely unpatchable. While Mark proved the concept, we haven't had a consumer-ready "modchip" to automate this process for regular users. However, hardware developer GFL_Tech has officially stepped up to change that. They have launched an open-source hardware project to design, build, and code a functional physical modchip for the Bliss Hack. I wanted to put together a tracking thread here on GBATemp to log their engineering progress, layout the roadmap, and get more eyes from the HW hacking scene on this project. The Hardware and How It Works Unlike the original Xbox ModXO project, which uses a cheap Raspberry Pi RP2040 to mimic a flash chip, glitching the Xbox One requires insane, sub-nanosecond timing precision. The GFL_Tech modchip is currently leveraging a hybrid approach to tackle the security processor: Signal Processing: Utilizing a TLV3201 high-speed comparator circuit to clean up and track the motherboard's hardware states. Sidechannel Isolation: Designing a custom Quick Solder Board (QSB) to hook directly into the EFUSE lines, tuning resistor values to kill signal noise. The Glitch Trigger: The end goal is using a microcontroller/CPLD setup to automatically sweep timing profiles against the EMMC DAT0 lines to intercept execution flow and drop the voltage rail at the exact microsecond required. The Project Roadmap and Current Status GFL_Tech is treating this as a transparent, step-by-step engineering journey. Here is where the project currently sits: Phase 1: Sourcing and teardown of a 2013 "Day One" Xbox One retail testbed. (Completed) Phase 2: Successful testing of the TLV3201 comparator circuit. (Completed) Phase 3: Finalizing the EFUSE QSB layout and stabilizing pull-up/pull-down noise. (In Progress) Phase 4: Coding the automated glitch-sweep logic for the MCU. (Planned) Phase 5: Real-time timing sweeps against the EMMC lines to hijack execution flow. (Planned) Phase 6: Public V1 Release featuring open-source PCB schematics, code, and installation guides for the community to test and refine. (Planned) Where to Follow and Contribute If you want to look at the hardware schematics, trace their engineering steps, or contribute to the codebase, everything is being kept open: GitHub Source: https://github.com/GFLTech/Xbox-One-Bliss-Hack-GFL_Tech-Modchip- to check out the wiki and hardware roadmaps. Video Devlogs: They are documenting the actual hardware breakdowns, scope readouts, and circuit testing on YouTube under the handle @GFL_Tech. Videos

Thread starter Skeet1983
Start date Jul 31, 2014
Views 1,579
Replies 4

Skeet1983

Well-Known Member

Member

Level 12

Jul 31, 2014

I am thinking about getting an XBO. I already have a PS4, and had an X360 but sold it since I could play same games better on my laptop. Is it worth getting? Thoughts appreciated

DinohScene

Gay twink catboy

Supervisor

GBAtemp Patron ⚕️

Level 31

Jul 31, 2014

As for now, Nope.
Maybe later down in the line.
There's barely any exclusives out for it now.

Tom Bombadildo

Dick, With Balls

Member

Level 28

Aug 1, 2014

Next time, only make 1 thread for your question.

Pretty much what Dinoh said. There aren't any worthwhile exclusives for the Xbox One right now, and there won't be for another .5-1 year.

Skeet1983

Well-Known Member

Member

Level 12

Aug 1, 2014

Ok. Thanks for info

Should I rebuy a 360 instead? Missed out on later Halos and Kinect.

DinohScene

Gay twink catboy

Supervisor

GBAtemp Patron ⚕️

Level 31

Aug 1, 2014

You could yes.
360 games won't be playable on the XBone.
Altough rumor has it that MS is working an emulation profile for it but don't hold high hopes for it.