{"guid":"149f13d4-cc8c-49a9-9e68-544754646022","title":"Downgrading iOS: From past to present","subtitle":null,"slug":"33c3-7888-downgrading_ios_from_past_to_present","link":"https://fahrplan.events.ccc.de/congress/2016/Fahrplan/events/7888.html","description":"This talk is about the iOS secure boot chain and how it changed throughout different iOS versions, while focusing on downgrading despite countermesures. \nIt will explain basics like what SHSH blobs and APTickets are and how IMG3 and IMG4 file format works.\nAlso a new technique called \"prometheus\" will be introduced which allows for the first time downgrading 64bit devices.","original_language":"eng","persons":["tihmstar"],"tags":["Security"],"view_count":3657,"promoted":false,"date":"2016-12-28T20:30:00.000+01:00","release_date":"2016-12-28T01:00:00.000+01:00","updated_at":"2026-04-16T10:45:05.031+02:00","length":3126,"duration":3126,"thumb_url":"https://static.media.ccc.de/media/congress/2016/7888-hd.jpg","poster_url":"https://static.media.ccc.de/media/congress/2016/7888-hd_preview.jpg","timeline_url":"https://static.media.ccc.de/media/congress/2016/149f13d4-cc8c-49a9-9e68-544754646022-timeline.jpg","thumbnails_url":"https://static.media.ccc.de/media/congress/2016/149f13d4-cc8c-49a9-9e68-544754646022-thumbnails.vtt","frontend_link":"https://media.ccc.de/v/33c3-7888-downgrading_ios_from_past_to_present","url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_title":"33C3: works for me","conference_url":"https://api.media.ccc.de/public/conferences/33c3","related":[{"event_id":3615,"event_guid":"74783236-46f4-493c-9574-1b27a44847b7","weight":43},{"event_id":3629,"event_guid":"686b1941-b211-4902-b4c4-1d642398e08b","weight":48},{"event_id":3640,"event_guid":"700a07e7-a9c4-437b-a4c5-4491b23a9b4a","weight":63},{"event_id":3656,"event_guid":"1a6657a2-b6c2-4acc-b8fc-5ec081c0877f","weight":32},{"event_id":3671,"event_guid":"4ef69e6a-026f-4b30-888d-af654b220a3d","weight":32},{"event_id":3676,"event_guid":"f6811c99-96af-44d5-b82d-5afe826b2caf","weight":35},{"event_id":3683,"event_guid":"1b27dbeb-cffc-48a1-b2e6-b2011c338a50","weight":41},{"event_id":3687,"event_guid":"5ae90a09-0b83-4357-bdb4-9afc04100c68","weight":35},{"event_id":3689,"event_guid":"1f7eb981-2819-4824-8f40-4ddde0be7bf3","weight":63},{"event_id":3690,"event_guid":"8d0aed87-2484-4880-ae08-2dc3c7898959","weight":35},{"event_id":3694,"event_guid":"ef62eb53-cb69-42c6-aab0-bc9d3b0e1e92","weight":38},{"event_id":3695,"event_guid":"c300b194-2a85-4705-92aa-b4e789882303","weight":74},{"event_id":3701,"event_guid":"155a622a-196e-4e05-a262-88f3a7726bbe","weight":30},{"event_id":3708,"event_guid":"aaec73e9-66b9-46d2-aa0f-9f43018198ea","weight":35},{"event_id":3731,"event_guid":"bc638f9f-0370-42f9-b83c-f85cca4ca38d","weight":37},{"event_id":3734,"event_guid":"34ea8f1f-9fad-41aa-8424-e833f10e5e8b","weight":35},{"event_id":3760,"event_guid":"1c75e6a1-e586-4b91-abce-92a4561d0181","weight":54}],"recordings":[{"size":null,"length":null,"mime_type":"application/x-subrip","language":"eng","filename":"DRAFT_33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present.en_DRAFT.srt","state":"todo","folder":"","high_quality":true,"width":null,"height":null,"updated_at":"2022-01-15T17:12:20.989+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/DRAFT_33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present.en_DRAFT.srt","url":"https://api.media.ccc.de/public/recordings/50336","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":232,"length":3126,"mime_type":"video/mp4","language":"eng","filename":"33c3-7888-eng-Downgrading_iOS_From_past_to_present.mp4","state":"new","folder":"h264-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2016-12-28T23:32:55.614+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/h264-hd/33c3-7888-eng-Downgrading_iOS_From_past_to_present.mp4","url":"https://api.media.ccc.de/public/recordings/14083","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":267,"length":3126,"mime_type":"video/mp4","language":"deu","filename":"33c3-7888-deu-Downgrading_iOS_From_past_to_present.mp4","state":"new","folder":"h264-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2016-12-28T23:33:10.002+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/h264-hd/33c3-7888-deu-Downgrading_iOS_From_past_to_present.mp4","url":"https://api.media.ccc.de/public/recordings/14084","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":340,"length":3126,"mime_type":"video/mp4","language":"eng-deu","filename":"33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_hd.mp4","state":"new","folder":"h264-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2016-12-28T23:33:23.103+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/h264-hd/33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_hd.mp4","url":"https://api.media.ccc.de/public/recordings/14085","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":47,"length":3113,"mime_type":"audio/mpeg","language":"eng","filename":"33c3-7888-eng-Downgrading_iOS_From_past_to_present.mp3","state":"new","folder":"mp3","high_quality":false,"width":0,"height":0,"updated_at":"2016-12-29T03:05:47.729+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/mp3/33c3-7888-eng-Downgrading_iOS_From_past_to_present.mp3","url":"https://api.media.ccc.de/public/recordings/14125","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":132,"length":3126,"mime_type":"video/mp4","language":"eng-deu","filename":"33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_sd.mp4","state":"new","folder":"h264-sd","high_quality":false,"width":720,"height":576,"updated_at":"2016-12-29T03:06:36.968+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/h264-sd/33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_sd.mp4","url":"https://api.media.ccc.de/public/recordings/14126","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":43,"length":3113,"mime_type":"audio/opus","language":"eng","filename":"33c3-7888-eng-Downgrading_iOS_From_past_to_present.opus","state":"new","folder":"opus","high_quality":false,"width":0,"height":0,"updated_at":"2016-12-29T03:07:00.740+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/opus/33c3-7888-eng-Downgrading_iOS_From_past_to_present.opus","url":"https://api.media.ccc.de/public/recordings/14127","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":115,"length":3126,"mime_type":"video/webm","language":"eng-deu","filename":"33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_webm-sd.webm","state":"new","folder":"webm-sd","high_quality":false,"width":720,"height":576,"updated_at":"2016-12-29T03:07:27.355+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/webm-sd/33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_webm-sd.webm","url":"https://api.media.ccc.de/public/recordings/14128","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"},{"size":253,"length":3126,"mime_type":"video/webm","language":"eng-deu","filename":"33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_webm-hd.webm","state":"new","folder":"webm-hd","high_quality":true,"width":1920,"height":1080,"updated_at":"2016-12-29T03:12:17.188+01:00","recording_url":"https://cdn.media.ccc.de/congress/2016/webm-hd/33c3-7888-eng-deu-Downgrading_iOS_From_past_to_present_webm-hd.webm","url":"https://api.media.ccc.de/public/recordings/14136","event_url":"https://api.media.ccc.de/public/events/149f13d4-cc8c-49a9-9e68-544754646022","conference_url":"https://api.media.ccc.de/public/conferences/33c3"}]}