Add-on dossier
CRC16/XMODEM firmware integrity repair
A linkable lifecycle record for hardware expansions, app ecosystems, firmware upgrades, cases, radio parts, and post-event badge experiments.
Back to add-ons index
official challenge PDF
Official PDF by Nathan Taylor covering ATmega1284P, FTDI serial-over-USB, bootloader-preserving flash writes, soft-brick risk, firmware integrity checks, CRC16/XMODEM, and all-nine-challenges completion.
Badge: CyberThreat 2024 Hackable Badge
official challenge PDF
Official PDF by badge challenge author Nathan Taylor covering USB serial, Optiboot, avrdude firmware dumping, Ghidra AVR analysis, stack overwrite, and the Echo Service challenge solve.
Badge: CyberThreat 2024 Hackable Badge
official event page
Official CyberThreat page for the London 2024 event, 450+ in-person attendees, thousands online, brand-new Secure Impact hackable badges, nine challenges, and links to final-challenge walkthroughs.
Badge: CyberThreat 2024 Hackable Badge
official walkthrough video
Officially linked video walkthrough for CyberThreat 2024 badge challenges one through seven.
Badge: CyberThreat 2024 Hackable Badge
CyberThreat / SANS Institute · retrieved 2026-05-15
Primary source for CyberThreat's SANS/NCSC context, London 2024 event recap, in-person and online attendance, Secure Impact hackable badges, nine challenge count, and walkthrough links.
Badge: CyberThreat 2024 Hackable Badge
CyberThreat / Secure Impact · retrieved 2026-05-15
Primary technical source for ATmega1284P processor, FTDI serial converter, ISP versus bootloader programming context, avrdude `-D` write guidance, firmware checksum validation, CRC16/XMODEM repair, and all-nine-challenges completion.
Badge: CyberThreat 2024 Hackable Badge
CyberThreat / Secure Impact · retrieved 2026-05-15
Primary technical source for USB serial behavior, Optiboot at 115200 baud, avrdude flash dump command, Ghidra firmware analysis, and buffer-overflow challenge behavior.
Badge: CyberThreat 2024 Hackable Badge