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Root Restore original bootloader with S-ON

Hi all,
I would like to restore my original bootloader on my Desire. I have two - one purely stock, and one that I rooted and S-OFF with unrevoked. The one with S-OFF (security flag off) needs some warranty work so I need to set S-ON. I have the RUU for US Cellular and can get anything I may need for the working phone. Please help! I am willing to try pretty much anything to get it going.
[UTILITY] Android Flasher(Recovery,splash1,Radio,HBOOT,bootanim)[V1.6.1](15/01/11) - xda-developers

The above utility has now got a hboot flasher. It should be able to flash recovery and hboot.

I can't guarantee it works I have only ever flashed recovery and splash using it.

You coudl try it at your own risk.

if you do though, you would have to flash recovery first. You need s-off to use this and replacing the hboot will be s-on so you wont be able to flash recovery at all if you flash hboot first.

If you do risk it, would be interested to find out if it worked for you.
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On the unrevoked site - it says that S-ON is coming soon for the CDMA Desire. I tweeted to the @unrevoked team asking for help but I am not sure that will get me anywhere. Does anyone know if there is an official forum for unrevoked? Thanks for all these suggestions! I am going to keep trying until I find some answer. BTW, this is by far the most active Desire forum I have found. It is great.
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I'm just gonna +1 this. I had attempted to update to 2.2 today on my rooted 2.1, and HBoot stuff was keeping it from going on with the process. Eventually, I'm pretty sure I accidentally wiped Android off of it entirely, because I'm just left with HBoot and the recovery options.

If anyone can manage to get some sort of image to flash back to original stuff and all, PLEASE share. Would really not like to have to explain to the U.S. Cellular lady about why my phone just has little Androids on skateboards at the bottom of the screen!
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