[behnaam]

THE ORIGINAL THREAD CAN BE FOUND HERE
After alot of playing around at the #modaco IRC and reading this thread I tried to actually downgrade my hboot from 0.75 to 0.66 (dont ask me how I got 0.66).

OBS! There is no reason to downgrade in case you already have hboot version 0.75 or a rooted 0.80 device. This guide is for future leaks of a ENG spl or such.

Now here are the steps I took:

1. Download a RUU with your desired HBOOT version. Note down the version of the RUU's ROM, e.g. 1.15.405.4.
You can find a list of RUU's here

2. Go to this mtd0.img CID generator

3. In the CID generator enter the ROM version you noted down and set CID to 11111111. Let it generate and download it.

4. Download flash_image binary from here and then do the following in adb while the phone is connected:

adb push /{the folder u downloaded it to}/flash_image /data
adb push /{the folder u downloaded it to}/mtd0.img /data

5. In terminal app type following:

chmod 755 /data/flash_image
/data/flash_image misc /data/mtd0.img

Now the mainversion is changed, so that the we pass the RUU's version checking.

6. Type the following while you're device is connected to adb:

adb reboot oem-78

It will now reboot into RUU mode. OBS! dont panic, its supposed to just a image, nothing more. Make sure USB cable is connected to the device by:

fastboot devices

If it returns with a device, then you're good.

7. Run the RUU and let it work. Enjoy your downgraded HBOOT version.

This post has been edited by behnaam: 20 June 2010 - 01:03 PM

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[snear]

What's the reason for downgrading ? I'm on 7.5

[behnaam]

snear, on Jun 11 2010, 13:36, said:

What's the reason for downgrading ? I'm on 7.5

No need to downgrade, this is just in case HTC pushes a new hboot version that blocks the current root solution. Or in case we get a ENG SPL

[snear]

Ahh ok thanks , good to see progress !

[ice_prophey]

behnaam, on Jun 11 2010, 21:29, said:

OBS! There is no reason to downgrade in case you already have hboot version 0.75 or a rooted 0.80 device

Just to clarify.

If I have a unrooted 0.80 device (updated officially via OTA), I should use this method to downgrade to 0.75 HBOOT then proceed to use Pauls R5 method to root a 0.75 device?


(Just want to keep my options open)

Regards,

Ice.

[Arthur Hucksake]

Will this enable me to install an older rom?

I've noticed the battery life has been nowhere near as good since going from the 1.15s to the newest 1.20s, or is that down to the radio version?

[EddyOS]

Possibly just radio, you could flash an old one and go from there I suppose...

[EddyOS]

ice_prophey, on Jun 11 2010, 12:47, said:

Just to clarify.

If I have a unrooted 0.80 device (updated officially via OTA), I should use this method to downgrade to 0.75 HBOOT then proceed to use Pauls R5 method to root a 0.75 device?
(Just want to keep my options open)

Regards,

Ice.

You can root fine using HBOOT 0.80 as I've done it myself, the files are in the root thread...

[Subject Delta]

Would it be possible at some point in the future to use this method to flash a custom SPL and overcome the last bits of the root puzzle?

[ElDiablo77]

Subject Delta, on Jun 11 2010, 12:14, said:

Would it be possible at some point in the future to use this method to flash a custom SPL and overcome the last bits of the root puzzle?

Wh@ he said!

[Kushan]

Yeah, any word on this? Would be interesting to hear from someone who knows a bit more about this stuff.

[42turkeys]

Can you do this without root?

Just wondering for all those hero users out there...

[albino71]

Works like a charme! Tnx

[stuart.q]

Hi there,

I am running HBOOT .80 and need to restore RUU_Bravo_Telstra_WWE_1.15.841.14_R4_Radio_32.30.00.28U_4.05.00.11_123851 which only works with HBOOT .75.

How do I enter the version number into the CID generator - it is 11 characters long and will not be accepted.

Appreciate your work,

-Stuart

[albino71]

stuart.q, on Jun 21 2010, 18:01, said:

Hi there,

I am running HBOOT .80 and need to restore RUU_Bravo_Telstra_WWE_1.15.841.14_R4_Radio_32.30.00.28U_4.05.00.11_123851 which only works with HBOOT .75.

How do I enter the version number into the CID generator - it is 11 characters long and will not be accepted.

Appreciate your work,

-Stuart

Someone correct me if i'm wrong, but i think it's ok to use 1.15.504.3. The RUU will check if your current version isn't newer than the one you're gonna flash.

[bllmcleod]

hi I was wondering if you could help my phone is t mobile and has 0.80 bootloader via t mobile ota update so I was wondering if I could unroot using the t mob 1.21.110.4 rom without going to bootloader 0.75. my current flashed rom is the r6 fear free one. I still have gold card, but I am very much a beginner with flashing so any help greatly appreciated, thanks in advance by Billy

[ryancy]

the above method only works on rooted device? what about non rooted ones?

[dodolom]

ryancy, on Jun 23 2010, 13:17, said:

the above method only works on rooted device? what about non rooted ones?

Hi guys,

I am on the same boat. I was testing the how to unroot your phone and accidentally put the Virgin Mobile Stock Rom 1.23.xxx.x and I can not downgrade now because the method above is for rooted phones.

Any suggestions?

Thnx

[ninjo]

im trying to downgrade and get ........ to' /data/flash image' : permission denied

i tried googling and people say u need a rooted android to be able to do it??

but im pretty sure when i went to try root my android it says to follow this topic before rooting if you dont meet the requirements??

please help ^^

[valerebel]

How do I tell what HBOOT version I have?

Cheers

-valerebel

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