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- VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG HOW TO
- VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG SERIAL
- VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG UPDATE
- VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG CODE
VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG SERIAL
SDO - Serial Data Output (this is how we get data back from the ATtiny).The HVSP programmer uses a proprietary protocol over 4 I/O pins: I used a Saleae USB logic analyzer to record the signals so I could compare them. So obviously, something strange was going with that chip on the skull: the HVSP programmer could identify it, but couldn't set the fuses? huh? Comparing SignalsĪt this point, I decided to take a look at the communication that was going between the HVSP programmer and the bricked ATtiny's.
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To make sure my setup was correct, I tried recovering another ATtiny, which I intentionally "bricked" by disabling the reset pin, and the HVSP recovery succeeded: the LED went briefly on, then stayed off.
VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG UPDATE
This time, the LED blinked fast, at about 5hz - meaning, it could identify the chip, but could not update the fuses? huh?
VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG CODE
I fixed that, reuploaded the HVSP code to the ATtiny, and gave it another shot. Apparently, the HVSP programmer's ATtiny had the clock configured incorrectly, so delay() did not work as expected causing the LED to blink really fast, which seemed as if it was just on all the time. Looking as it closer, I realized it was just blinking very fast. I got an unexpected result: the LED would just stay on, which is definitely not an expected result. LED blinks fast (5hz): ATtiny fuse values were not updated correctlyĪfter programming the second ATtiny and connecting everything, I switched it on and.LED blinks slowly (1hz): ATtiny could not be identified.LED goes on briefly, then off: GREAT SUCCESS.The idea is simple: you upload the code to a second ATtiny (we'll call it the HVSP programmer from this point), wire it to the first one (the bricked ATtiny), provide 12V for the transistor, power on the circuit, and observe the result: It even included the code that would reset the fuses to their original values.ĪTtiny45 has cursed fuses, trying to fix with HVSP ⚡ /7vUFjuQ2dq- The Skull November 10, 2020
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VOLCANO BOX RESET PATTERN LOCK WITHOUT USB DEBUG HOW TO
I'm not the first to face this situation, so quick googling found a handy tutorial which explains how to build this kind of HVSP programmer with just one more ATtiny chip, 2N3904 transistor, an LED and some resistors. It's like a small backdoor built into the chip, to help you fix things when hell breaks loose and the chip stops talking to you. However, HVSP, as the name suggests, requires a non-trivial setup: you have to apply 12V to the reset pin. It lets you reprogram the chip even if you disabled the reset pin and the standard serial programming interface. Now what? Enter High-Voltage ⚡įortunately, even when things go wrong, there's a special programming interface built into the chip, high-voltage serial programming (HVSP), or "god mode" as I call it. So my ATtiny's fuses probably got cursed with bad values that disable programming. Microchip even created a dedicated page for all the things that can go wrong. It's very easy to shoot yourself in the foot by disabling the SPI (serial programming interface), disabling the reset pin (which is required for programming), or just choosing the wrong clock source. They control various aspects of the microcontroller such as the clock source (internal/external), chip reprogramming, debugging interface, etc. The Cursed Fuses ?ĪTtiny chips (and in general, microcontrollers from the AVR family) have some configuration bytes called fuses. Who knows, you might brick your ATtiny85 and this will save your day. Now, let me share with you how I fixed that. So I was a bonehead and ended up with a broken skull. To be honest, it was a bit of my fault: I left some pins connected to an Uno board while trying to program the chip, and they probably interfered with the process. I found myself in this frustrating situation while working on The Skull, a new hardware CTF challenge with a spooky twist. All of the sudden, it stops responding - and you are no longer able to program it or upload new code. You are in the middle of working on an exciting project with ATtiny85.