@tntexplosivesltd

tntexplosivesltd

@tntexplosivesltdAuckland, New ZealandJoined July 2026

Reverse Engineering Audio Hardware for Musicians & Engineers

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GP-200 Reverse Engineeringgp200-reversing.hashnode.dev5 posts

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Recently published

Ttntexplosivesltdgp200-reversing.hashnode.dev1d ago · 10 min read

Building 'gp200fw' - Design, Build, and a Firmware Patch That Boots

Post 4 ended with the protocol fully understood and the check byte solved, but nothing actually sent to the device: This post details designing a tool, building it module by module, and testing it on

Ttntexplosivesltdgp200-reversing.hashnode.dev4d ago · 11 min read

Decoding the Updater, and the Byte That Fought Back

Post 3 ended on a specific kind of anticlimax: the fuse says there's no lock on this device, and it turns out someone already walked through the open door. lshug's GP-200 English patch proves it: a mo

Ttntexplosivesltdgp200-reversing.hashnode.devJul 27 · 10 min read

Flash Dump & Secure-Boot State

Post 2 ended with the debug port confirmed live: the Debug Port answered, the core enumerated, and a single test read came back byte-for-byte correct. That proved memory on the GP-200 is readable. It

Ttntexplosivesltdgp200-reversing.hashnode.devJul 22 · 16 min read

Inside the GP-200

Post 1 ended with the firmware telling us everything it could: a readable, unencrypted update file that hinted at an open door but couldn't prove it. The only way to actually test that is to open the

Ttntexplosivesltdgp200-reversing.hashnode.devJul 20 · 9 min read

The GP-200 landscape

The Valeton GP-200 is a $350 guitar multi-effects pedal with 233 built-in effects and neural amp modeling. Inside is an NXP i.MX RT1060 running at 600MHz. With Claude's help, I've been reverse enginee

tntexplosivesltd

About

Available for

tntexplosivesltd's blogs

Recently published

Building 'gp200fw' - Design, Build, and a Firmware Patch That Boots

Decoding the Updater, and the Byte That Fought Back

Flash Dump & Secure-Boot State

Inside the GP-200

The GP-200 landscape

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tntexplosivesltd

About

Available for

tntexplosivesltd's blogs

Recently published

Building 'gp200fw' - Design, Build, and a Firmware Patch That Boots

Decoding the Updater, and the Byte That Fought Back

Flash Dump & Secure-Boot State

Inside the GP-200

The GP-200 landscape