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[FAQ] HBOOT 0.83 / 0.92 / SLCD - rooting and recovery

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By teppic74, Retired Recognized Developer on 9th August 2010, 02:22 PM
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Note: This is an old thread and the information in here may not be up to date.

This thread is intended mainly for people who have phones with SLCD displays. Please take a minute to read it before attempting to run any updates, downgrades, or applying any RUUs.

There have been lots of posts and confusion about HBOOT 0.83, 0.92 and SLCD over the last few weeks. These newer versions of the bootloader are installed by certain official updates, and come pre-installed on most new phones. To get straight to the point: HBOOT 0.83 is not a problem. Quite a few people have ended up breaking their displays by trying to downgrade, when it isn't necessary.

Q. I applied an RUU/downgraded to HBOOT 0.80 and now my screen doesn't work.
A. You can recover by upgrading to stock froyo. Just insert your goldcard and run this generic RUU:

Q. Which RUUs are safe to use with an SLCD screen?
A. All froyo RUUs are safe (release beginning 2.x). Otherwise do not attempt to use any other RUU that isn't listed in this post.

Q. How do I upgrade to stock unbranded froyo (without root)?
A. Use the RUU for froyo in question 1.

Q. I have upgraded to froyo, but want to downgrade/root.
A. Don't try using old methods as they will break SLCD screens. You can use a tool I have developed. Read the thread here:

Q. How do I know if my screen is SLCD or AMOLED?
A. A black background in low light, at certain angles, will have a slight grey sheen to it if your screen is SLCD. On an AMOLED screen it will remain the same black. If you got your phone before July 2010 it is AMOLED.

Q. Does HBOOT 0.83 mean I have an SLCD screen?
A. No.

Q. Can I root my phone on HBOOT 0.83 and use custom recovery?
A. Yes! Use unrevoked3.

Q. My screen goes blank when I use custom recovery with unrevoked3.
A. You are using an old version of unrevoked3. Please try again with the latest version.

Q. Can I use AmonRA custom recovery instead?
A. Yes, it has now been updated to support SLCD. Install via unrevoked3 with this image:

Q. What is the difference between HBOOT 0.83 and 0.92?
A. 0.92 is installed currently only if you apply the official froyo update or if you buy an unbranded phone with froyo. You cannot directly root running froyo yet, but this will soon be available. In the meantime you must downgrade to Android 2.1.

Q. How do I downgrade to HBOOT 0.80 from 0.83?
A. Don't - there is absolutely no reason to. If you want to root or use a custom ROM or debrand you should not try to downgrade.

Q. Can I debrand my phone with HBOOT 0.83?
A. Yes. What's important is your software release, not your bootloader version. If your software version is 1.21.405.2 or lower (for example, branded O2 phones), you can simply use this generic RUU with a goldcard to debrand and install stock 1.21.405.2. You can then root or upgrade to froyo if you wish to. This RUU will also flash your HBOOT to 0.83.

Q. My software version is higher than 1.21.405.2 (e.g. I applied the Vodafone branding update). Can I debrand?
A. If you want Android 2.1 you need to use the downgrade tool. If you want froyo, just apply the froyo RUU as described in the first question.

Q. I have an SLCD screen. Can I run custom ROMs?
A. The latest ones will work. The pre-rooted version of official froyo works fine including all custom ROMs based on it (kernel

Q. Can I rebrand my rooted/debranded SLCD phone?
A. You will need a branded froyo RUU. Currently available: O2
Last edited by teppic74; 5th April 2011 at 03:55 PM.
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9th August 2010, 09:40 PM |#2  
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Actually, I have just managed to downgrade and debrand my SLED Desire from Vodafone's hboot 0.83 & 1.24 firmware to HTC stock 0.80 and 1.21.405.2 (without wrecking my screen in the process). I'll post a detailed description after I'm done doing the victory dance.
9th August 2010, 09:42 PM |#3  
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@bloodmeg - you must have an AMOLED screen. SLCD will NOT work on HBOOT 0.80.
9th August 2010, 09:50 PM |#4  
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Ah, you're right, I got a bit carried away there. I did not downgrade the HBOOT, just the firmware to 1.21 (with 1.21.405.2_T2_Radio_32.41.00.32U_4.08.00.09 which was reported to work with SLCD).

Thanks for correcting me.
9th August 2010, 10:00 PM |#5  
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The RUU flash process usually checks the installed software version and refuses to work if it's higher than what you're trying to install. This is why the froyo downgrade reports itself with a fake version.

edit: Although thinking about it, it would be possible to root the phone, put in a fake version into the misc partition (e.g. 1.21.405.2), and then that should trick the RUU checker into thinking you have that version installed.
Last edited by teppic74; 9th August 2010 at 10:17 PM.
9th August 2010, 10:27 PM |#6  
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Originally Posted by teppic74

edit: Although thinking about it, it would be possible to root the phone, put in a fake version into the misc partition (e.g. 1.21.405.2), and then that should trick the RUU checker into thinking you have that version installed.

Which is exactly what I did.
9th August 2010, 10:35 PM |#7  
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Originally Posted by bloodmeg

Which is exactly what I did.

Can you post the precise steps you used so that other people can do the same?
11th August 2010, 11:59 AM |#8  
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Added minor edits to take into account the procedure for rooting the phone without a screen.
11th August 2010, 07:19 PM |#9  
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Thanks. Finally got my phone debranded. It was bought 2 days ago, branded to O2 Ireland. Don`t have it rooted, but now I'm downloading froyo on my phone. Don't have to wait for the O2 to release it.
12th August 2010, 01:15 PM |#10  
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I've realised to downgrade from Vodafone branding (or any software version higher than 1.21.xx) you just need to run the fix rather than mess around with the misc partition yourself. It sets your software version to 1.15.405.3, so any RUU with later software will work. Obviously with an SLCD screen you still have to flash the correct RUU.
19th August 2010, 10:33 PM |#11  
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How do I implement the .img linked to in Question 2? Do I put it on the root of my SD card before I run unrevoked3?

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