mirror of https://github.com/chylex/Blog.git
75 lines
3.8 KiB
Markdown
75 lines
3.8 KiB
Markdown
---
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title: "Origin OS Version Bypass"
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subtitle: "revision 4, %pub"
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date: 2019-12-20
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commentid: 1
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permalink: /post/origin-os-bypass/revision-4
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hidden: true
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breadcrumbs:
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- revlatest: /post/origin-os-bypass
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- revcurrent: 4
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---
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This guide shows how to download and run Need for Speed Heat on Windows 7 or Windows 8, by patching Origin to disable its operating system check.
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If this works for you, I'd appreciate if you [bought me a coffee](https://ko-fi.com/chylex).
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# Prerequisites
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Get a hex editor that can handle big files. I'm using [HxD](https://mh-nexus.de/en/hxd/) (Portable).
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**Check your Origin.exe version:**
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- For **10.5.57.35162**, this revision should work
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- For **10.5.56.33908**, see [previous revision]({% post_url 2019-12-13-origin-os-bypass-r3 %})
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- For **10.5.55.33574**, see [previous revision]({% post_url 2019-11-14-origin-os-bypass-r2 %})
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- For **10.5.52.32372**, see [previous revision]({% post_url 2019-11-12-origin-os-bypass-r1 %})
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Alternatively, you can try the [advanced patching guide]({% post_url 2020-03-06-origin-os-bypass-advanced-patching-guide %}) that should work on any version, but the advanced guide is a lot more involved and there be dragons.
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I recommend switching Origin to offline mode, because if the game needs an update, you will have to do this again.
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# Edits
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Open each file in the hex editor. Go to each offset, make sure the sequence of bytes at that offset is the same as what's in the **Old** column, change it to what's in the **New** column.
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In HxD, use *Search - Go to...* (Ctrl+G), paste in the offset, click OK, **make sure your cursor is inside the hex section and not the decoded text section**, and type in the new hex values.
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## Origin.exe
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| Offset | Old | New |
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|--------|-------------------|-------------------|
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| 1FEA0 | 75 | EB |
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| 1FF11 | 75 | EB |
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| 1FF7B | 0F 85 92 00 00 00 | E9 93 00 00 00 90 |
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| 1FFCA | 75 | EB |
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| 29C10 | 0F 8F 07 01 00 00 | E9 08 01 00 00 90 |
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| 29D1F | 74 | EB |
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| 29F2C | 74 | EB |
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## OriginClient.dll
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| Offset | Old | New |
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|--------|-------------------|-------------------|
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| 3CA505 | 0F 84 37 01 00 00 | E9 38 01 00 00 90 |
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| 3CA68A | 0F 84 4B 01 00 00 | E9 4C 01 00 00 90 |
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## OriginClientService.exe
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| Offset | Old | New |
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|--------|----------------------|----------------------|
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| 2F0C0 | 75 | EB |
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| 348D6 | 75 4D 68 4C 03 00 00 | E9 7C 03 00 00 90 90 |
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| 34952 | 75 | EB |
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| 34AAF | 0F 84 46 01 00 00 | E9 47 01 00 00 90 |
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| 34BBF | 0F 84 79 00 00 00 | E9 7A 00 00 00 90 |
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# Explanation
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If you want a very brief explanation, hex `74`/`75` are conditional jumps, and we turn them into `EB`, which is a forced jump, to skip over a bunch of code. Sequences `0F 8x` are generally variants of jumps that can jump further, and their forced jump equivalent is `E9` which takes 1 byte less, so whatever follows after the jump destination (4 bytes) is turned into `90`, a no-op instruction that does nothing but prevents shifting everything by a byte.
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In all cases, we skip over code that either acts upon the result of an OS version check, or the result of a signature check. Most of it is signature checks that *throw a fit* (technical term) when one of the exe/dll files is modified. It's so effective that you need to modify 3 files instead of 1 to get this working (although it's probably a good idea to be validating exe files because parts of Origin run with SYSTEM level privileges, more privileged than your *poweruser* administrator account).
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HxD also has a handy Data Inspector panel where, if you select one or more bytes, you can see the x86-64 instruction it represents.
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