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 PostPost subject: Windows 10 Mobile on a RT Device - Possibile?        Posted: Wed Dec 09, 2015 6:36 am 
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Some guys in Baidu Tieba tried to run Windows 10 IoT Core on the Lumia 2520, and succeeded. (No touch drivers or anything else)
This is the post, in Chinese unfortunately:http://tieba.baidu.com/mo/q---70A2AEC80C022BA460AE3871100644B3%3AFG%3D1--1-3-0--2--wapp_1449582391345_951/m?kz=4171436114&is_bakan=0&lp=5010&pinf=1_2_20
This is the mobile version since I am posting from a phone.
I will repost the images here when I come back home.

So, is it possible to run 10 Mobile on a RT device? That is more useful than the IoT one, and it maybe a good Windows RT replacement.
Also, is it possible to insert drivers into a Windows 10 Mobile image?


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Wed Dec 09, 2015 9:19 am 
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I think you'd have to break Secure Boot, which is going to be a problem for Windows RT devices, which have it permanently enabled.

The problem is IoT works because it uses the standard Windows CA, like Windows RT did. Windows Phone / Windows Mobile uses its own CA and will therefore be blocked by Secure Boot on the UEFI of standard production Windows RT tablets.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sat Dec 12, 2015 2:46 am 
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If Softwares like WPInternals *are able* to root Secure Boot, I think will be easy to do the same with RT knowing all mechanism about Windows 10 boot steps.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sun Dec 13, 2015 1:38 am 
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MrUTB wrote:
If Softwares like WPInternals *are able* to root Secure Boot, I think will be easy to do the same with RT knowing all mechanism about Windows 10 boot steps.
No. Just no. You can't "root Secure Boot". All WPInternals does is make use of an exploitable flaw in older Qualcomm chips that allows modifying things like the state of SecureBoot even when you shouldn't have access to change said "switch".


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sun Dec 13, 2015 9:22 am 
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Lukas Marsik wrote:
MrUTB wrote:
If Softwares like WPInternals *are able* to root Secure Boot, I think will be easy to do the same with RT knowing all mechanism about Windows 10 boot steps.
No. Just no. You can't "root Secure Boot". All WPInternals does is make use of an exploitable flaw in older Qualcomm chips that allows modifying things like the state of SecureBoot even when you shouldn't have access to change said "switch".


Lumia 2520 also uses a Snapdragon 800... Maybe it will work?


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Mon Dec 14, 2015 2:55 am 
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Lukas Marsik wrote:
MrUTB wrote:
If Softwares like WPInternals *are able* to root Secure Boot, I think will be easy to do the same with RT knowing all mechanism about Windows 10 boot steps.
No. Just no. You can't "root Secure Boot". All WPInternals does is make use of an exploitable flaw in older Qualcomm chips that allows modifying things like the state of SecureBoot even when you shouldn't have access to change said "switch".


Really?

http://forum.xda-developers.com/windows ... 0-t3259359


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Mon Dec 14, 2015 3:05 pm 
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MrUTB wrote:
This thread is about booting Windows 10 Mobile on a RT device and this is the exact opposite. Would be nice to know how things work, especially when they are explained the thread you are talking in.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Wed Dec 16, 2015 7:47 am 
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Look the Hounsell's response and then check the topic from XDA again. I think I don't need to explain that. I consider obvious.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Wed Dec 16, 2015 9:10 am 
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What you apparently consider so obvious is inexplicable, considering you are wrong.

Running RT on a phone is possible because with Secure Boot broken, you are no longer restricted to the Windows Phone-signed binaries.

Running W10M on an RT device is currently not possible because there is no known way to bypass Secure Boot for RT devices, or at least not to the same extent, anyway.

On the other hand, RT devices will actually boot an IoT image, to the extent permitted by available drivers. This is because IoT binaries are signed by the main Windows certificate, and are therefore recognised as valid by the bootloader even without breaking Secure Boot. You'll probably run into driver troubles, but otherwise it'll all work.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Thu Dec 17, 2015 12:43 am 
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hounsell wrote:
The problem is IoT works because it uses the standard Windows CA


So, if you said that, and It was possible before to *unlock" secure boot from Windows 10 General SKUs, I can say "it's possible to do the same" with RT Devices.

https://technet.microsoft.com/en-us/lib ... 47883.aspx


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Thu Dec 17, 2015 2:58 am 
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MrUTB wrote:
hounsell wrote:
The problem is IoT works because it uses the standard Windows CA


So, if you said that, and It was possible before to *unlock" secure boot from Windows 10 General SKUs, I can say "it's possible to do the same" with RT Devices.

https://technet.microsoft.com/en-us/lib ... 47883.aspx

You do realize that you can't make W10M work on RT devices by simply hacking the install media -- that to break Secure Boot will require reverse engineering the embedded UEFI on the physical RT tablet device -- you do understand this, correct?


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Thu Dec 17, 2015 6:22 am 
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I know what is the secure boot process. Don't deal with me like a baby. I'm discussing about this and I'm trying to understand why explanations by other guys.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Fri Dec 25, 2015 7:16 am 
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MrUTB wrote:
I know what is the secure boot process. Don't deal with me like a baby. I'm discussing about this and I'm trying to understand why explanations by other guys.

Sorry, not trying to insult you here; I'm just confused about what point you're trying to make. I still don't understand, so I'll just leave this topic alone. Kind regards.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Mon Jan 15, 2018 9:02 am 
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I read the chinese post, within my research.So I want to share something.
First, you must crack the Secure Boot. Then, you need get into Mass Storage, however you need a engineering SBL3, you can only find it from an ES Device, which is difficult to get. Third, you can flash W10M into the eMMC. To load the custom OS well, you need some proper drivers, this is the difficultest part, without drivers, you can even not to Boot.
All in all, to run W10M on a RT device is only on theory level, it is so difficult to finish all parts without MSFT.


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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Fri Jun 29, 2018 8:37 pm 
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Here is a Windows RT emulator: https://github.com/TeoIzAwezome/rtemu
It could be possible that this could run Windows Phone/10 Mobile since it does not have Secure Boot

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sun Jul 01, 2018 4:00 am 
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Has anyone thought about faking the W10M certificate with the RT one? That way the Os could technically be loaded, it's one way...

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Tue Jul 03, 2018 1:15 pm 
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If Mobile can run on the emulator then the only problem is secure boot and your method could possibly work.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Tue Jul 03, 2018 5:45 pm 
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Also an idea has come to my mind: Maybe if some loader like GRUB can fake the RT certificate and bypass the Secure Boot, it could then load the W10M OS and many other OSes, so I think the only problem here is to bypass the certificate of RT's Secure Boot, which I think is actually possible.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Fri Jul 06, 2018 5:08 pm 
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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Fri Jul 06, 2018 8:16 pm 
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*cough* Reverse engineering *cough*

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Fri Jul 06, 2018 9:13 pm 
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With NVIDIA Tegra devices running Android, there's an APX mode which may work like QHSUSB. In other words, a pre-BIOS or -UEFI layer which allows flashing firmware to ubrick a device.

We need to figure out how to boot into it if it exists. From there, we can find out the nature of the Secure Boot lock. Possibly it's an unaccessible BIOS setting, or a switch.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Tue Jul 31, 2018 6:35 pm 
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SistemaRayoXP wrote:
*cough* Reverse engineering *cough*

Look, you have absolutely no idea how this stuff even works. You're just spitting words out with no real knowledge of their actual meanings.

Briefly said, any EFI executable that's ran on a Secure Boot system must be signed by a certificate that is trusted by the firmware. Unless you can somehow get Grub signed by Microsoft's certificate, no "security certificate faking" is ever going to take place, no matter how much reverse engineering you employ. The much more plausible scenario is to get firmware to trust GRUB, which is much more safe and legal than stealing Microsoft's private keys.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sun Aug 19, 2018 8:38 am 
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You could take a look at that.
imbushuo done some work on launching RT on mobile devices.

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 PostPost subject: Re: Windows 10 Mobile on a RT Device - Possibile?        Posted: Sun Aug 19, 2018 5:20 pm 
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Since RT can boot on mobile, would that mean the reverse would work? Would W10M need RT drivers?
People have already claimed to exploit secure boot and run grub on RT, so I guess it's possible? Should it be easier now that SBDP is a thing?


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