Most locked 8-bit AVR parts can be read, and the honest answer for a given part number takes us a few minutes to give you. An AVR crack job means recovering the flash and EEPROM contents from an ATmega, ATtiny or AT90 device whose lock bits have been set, so you get a usable HEX or BIN file back. Feasibility depends on the exact die revision, the package, and whether the part is a mature Atmel-era device or a newer Microchip-branded one. Send the chip marking and we’ll tell you where yours sits.
What actually blocks you from reading a locked AVR
Classic AVR devices protect code with two lock bits, LB1 and LB2, plus a set of fuse bytes. When both lock bits are programmed, serial and parallel programming access to flash and EEPROM is disabled — the programmer can still talk to the chip, it just returns nothing useful. On many parts the only sanctioned way out is a chip erase, which wipes the very thing you’re trying to recover.
There’s a second layer worth knowing about. Boot lock bits (BLB0x and BLB1x) on parts with a bootloader section, like the ATmega128 or ATmega2560, control whether application code can read the boot section and vice versa. A design that used a self-programming bootloader may have locked things down in a way that changes what regions are reachable. That’s part of why we ask for the specific part number rather than just “an AVR.”
So the technical question in front of us is never “can you break AVR security in general.” It’s “for this die, in this package, with these bits set,
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