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travisjames 		Old
8th November 2010, 09:06 AM
(Last edited by travisjames; 14th November 2010 at 01:56 AM.)
#1  
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Location: Memphis, Tennessee

 
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Default [GUIDE] Downgrade ROM and Radio from OTA to Stock
This guide will show you how to downgrade your MyTouch 4G from the recently released OTA to the stock build.

This WILL wipe your device! I am not responsible for any damages!
NOTICE: A lot of people have reported -including me- that using this method to downgrade your firmware will cause your MT4G to not receive the OTA that was released right after the phone was.

What You Need:
  • Hex Editor such as Bliss
  • Temp-rooted MyTouch 4G
  • ADB
  • This ROM - Stock ROM

1. Download the ROM and rename to PD15IMG.zip
2. Place PD15IMG.zip on the root of your SD card
3. Un-mount SD Card
4. adb shell
5. su
6. Now, run this command:
Code:
dd if=/dev/block/mmcblk0p17 of=/sdcard/misc.img
7. Mount your SD card
8. Copy misc.img from your SD card to your computer
9. Now open the misc.img on your computer in your Hex Editor
10. You should see something like:
Code:
1.17.531.2
11. Change that to:
Code:
1.14.531.1
12. Now save as miscnew.img
13. Unmount your SD Card now
14. Now in adb shell run this command:
Code:
dd if=/sdcard/miscnew.img of=/dev/block/mmcblk0p17
15. Power off your device
16. Now boot into Hboot by holding down "volume down + power"
17. The phone will scan for PD15IMG.zip and will ask you to flash it
18. Select Yes [DUH!]

You should now be downgraded from the 2.2.1 OTA back to stock 2.2!

I would like to note that this downgrades the HBoot/Bootloader, radio, system, data, amongst other partitions of your phone.
Also, since I downgraded, I have not received any notifications for the OTA as of 11/8/10.

This guide is a derivative of Apache14's OTA and Radio downgrade guide for the T-Mobile G2: Here
Current Phones: HTC Dream(T-Mobile G1), Motorola CLIQ, HTC Glacier(T-Mobile MyTouch 4G)
Former Phones: HTC Vision (T-Mobile G2)
ROMS-CLIQ: Eclair2CLIQ, Hero2CLIQ, Froyo2CLIQ
My Website and Blog: TravisJames.net <-- You can find all my guides, mods, and ROMs on my blog!

Use Twitter? Follow me on Twitter
 
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cdw9800 		Old
8th November 2010, 10:00 AM
#2  
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Location: Bay Area
Default Cool
What are the advantages of downgrading?
Nokia Lumia 920 & Microsoft Surface RT Xbox 360 Windows 8 #TeamMicrosoft
 
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travisjames 		Old
8th November 2010, 11:10 AM
#3  
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Quote:
Originally Posted by cdw9800 View Post
What are the advantages of downgrading?
At the moment, probably nothing.

If an exploit for root were ever found in the original stock build, but was patched in the OTA, then this would be useful.
Current Phones: HTC Dream(T-Mobile G1), Motorola CLIQ, HTC Glacier(T-Mobile MyTouch 4G)
Former Phones: HTC Vision (T-Mobile G2)
ROMS-CLIQ: Eclair2CLIQ, Hero2CLIQ, Froyo2CLIQ
My Website and Blog: TravisJames.net <-- You can find all my guides, mods, and ROMs on my blog!

Use Twitter? Follow me on Twitter
 
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Phateless 		Old
8th November 2010, 07:16 PM
#4  
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Senior Member
Thanks Meter 425
Posts: 4,642
Join Date: Aug 2010
Location: Oakland
Quote:
Originally Posted by travisjames View Post
This guide will show you how to downgrade your MyTouch 4G from the recently released OTA to the stock build.

This WILL wipe your device! I am not responsible for any damages!

What You Need:
  • Hex Editor such as Bliss
  • Temp-rooted MyTouch 4G
  • ADB
  • This ROM - Stock ROM

1. Download the ROM and rename to PD15IMG.zip
2. Place PD15IMG.zip on the root of your SD card
3. Un-mount SD Card
4. adb shell
5. su
6. Now, run this command:
Code:
dd if=/dev/block/mmcblk0p17 of=/sdcard/misc.img
7. Mount your SD card
8. Copy misc.img from your SD card to your computer
9. Now open the misc.img on your computer in your Hex Editor
10. You should see something like:
Code:
1.17.531.2
11. Change that to:
Code:
1.14.531.1
12. Now save as miscnew.img
13. Unmount your SD Card now
14. Now in adb shell run this command:
Code:
dd if=/sdcard/miscnew.img of=/dev/block/mmcblk0p17
15. Power off your device
16. Now boot into Hboot by holding down "volume down + power"
17. The phone will scan for PD15IMG.zip and will ask you to flash it
18. Select Yes [DUH!]

You should now be downgraded from the 2.2.1 OTA back to stock 2.2!

I would like to note that this downgrades the HBoot/Bootloader, radio, system, data, amongst other partitions of your phone.
Also, since I downgraded, I have not received any notifications for the OTA as of 11/8/10.

This guide is a derivative of Apache14's OTA and Radio downgrade guide for the T-Mobile G2: Here
Nice work!

Quote:
Originally Posted by cdw9800 View Post
What are the advantages of downgrading?
This will probably be the first step to rooting when the devs finally figure it out. :thumbup:
-Joshua
All you need to get a firm solar iQuote is an internet connection and 3 minutes.
http://www.sungevity.com/get-your-iq...@sungevity.com

Dropbox FTW http://db.tt/sQjzpz9
2D Gallery! - http://www.mediafire.com/?mzmjmkzmyxj

myTouch 4G Links:
PD15IMG.zip (2.2.1)
DISPLAY TEST
 
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mikeschevelle 		Old
14th April 2012, 02:19 AM
#5  
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Senior Member
Thanks Meter 123
Posts: 1,328
Join Date: Dec 2007
thanks
AT&T rep

Samsung T999 - CMod 4.2

Past Devices
iPhone 4s (rocked the dark side for 2 weeks)
Samsung i-711 - Unlocked on TMO, Blaze modem
HTC Pyramid - MIUIv4
HTC Ruby - Speed ROM
LG G2X ICS Hellfire
Sensation sporting a MIUI/WinMo 7 blend
HTC Evo - CM7
Samsung Epic 4g Slide - CM7
HTC Vogue rocking NFS
 
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Mr Bill Florida 		Old
8th November 2010, 11:52 AM
#6  
Senior Member
Thanks Meter 7
Posts: 103
Join Date: Oct 2009
Location: Dunedin, Florida
I am getting..

cannot open for write: Read-only file system

That is after following everything to the letter....

Quote:
Originally Posted by travisjames View Post
This guide will show you how to downgrade your MyTouch 4G from the recently released OTA to the stock build.

This WILL wipe your device! I am not responsible for any damages!

What You Need:
  • Hex Editor such as Bliss
  • Temp-rooted MyTouch 4G
  • ADB
  • This ROM - Stock ROM

1. Download the ROM and rename to PD15IMG.zip
2. Place PD15IMG.zip on the root of your SD card
3. Un-mount SD Card
4. adb shell
5. su
6. Now, run this command:
Code:
dd if=/dev/block/mmcblk0p17 of=/sdcard/misc.img
7. Mount your SD card
8. Copy misc.img from your SD card to your computer
9. Now open the misc.img on your computer in your Hex Editor
10. You should see something like:
Code:
1.17.531.2
11. Change that to:
Code:
1.14.531.1
12. Now save as miscnew.img
13. Unmount your SD Card now
14. Now in adb shell run this command:
Code:
dd if=/sdcard/miscnew.img of=/dev/block/mmcblk0p17
15. Power off your device
16. Now boot into Hboot by holding down "volume down + power"
17. The phone will scan for PD15IMG.zip and will ask you to flash it
18. Select Yes [DUH!]

You should now be downgraded from the 2.2.1 OTA back to stock 2.2!

This guide is a derivative of Apache14's OTA and Radio downgrade guide for the T-Mobile G2: Here
Device: T-Mobile myTouch4g (Black) - Rooted 11/09/2010
Rooted: Permaroot
ROM: febycv's ICS 4.0.3 .: :: Creamed Glacier :: :. with Ultimate Online Theme Kitchen
Throttle Fix: APN Settings
Modding: Android Commander, Droid Explorer
Kitchen: Dsixda's HTC Android Kitchen's Latest
SPL: 0.85.2007
Radio:12.62.60.27_26.13.04.19
Recovery: madmaxx82's 4Ext Recovery Touch
SD Card: WinTec 16GB MicroSD class 10

Device: T-Mobile myTouch3g (Black) - Retired
 
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Mr Bill Florida 		Old
8th November 2010, 11:54 AM
#7  
Senior Member
Thanks Meter 7
Posts: 103
Join Date: Oct 2009
Location: Dunedin, Florida
NM, sdcard has to be mounted....
Device: T-Mobile myTouch4g (Black) - Rooted 11/09/2010
Rooted: Permaroot
ROM: febycv's ICS 4.0.3 .: :: Creamed Glacier :: :. with Ultimate Online Theme Kitchen
Throttle Fix: APN Settings
Modding: Android Commander, Droid Explorer
Kitchen: Dsixda's HTC Android Kitchen's Latest
SPL: 0.85.2007
Radio:12.62.60.27_26.13.04.19
Recovery: madmaxx82's 4Ext Recovery Touch
SD Card: WinTec 16GB MicroSD class 10

Device: T-Mobile myTouch3g (Black) - Retired
 
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travisjames 		Old
8th November 2010, 02:19 PM
#8  
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Member - OP
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Posts: 57
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Location: Memphis, Tennessee

 
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Quote:
Originally Posted by Mr Bill Florida View Post
NM, sdcard has to be mounted....
At which part does the sdcard have to be mounted?

During this part?:
Code:
dd if=/dev/block/mmcblk0p17 of=/sdcard/misc.img
I guess that would make sense, but I didn't have to have my SD Card mounted during this part which makes me wonder.
Current Phones: HTC Dream(T-Mobile G1), Motorola CLIQ, HTC Glacier(T-Mobile MyTouch 4G)
Former Phones: HTC Vision (T-Mobile G2)
ROMS-CLIQ: Eclair2CLIQ, Hero2CLIQ, Froyo2CLIQ
My Website and Blog: TravisJames.net <-- You can find all my guides, mods, and ROMs on my blog!

Use Twitter? Follow me on Twitter
 
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The Following User Says Thank You to travisjames For This Useful Post: [ Click to Expand ]
 
Mr Bill Florida 		Old
8th November 2010, 02:51 PM
#9  
Senior Member
Thanks Meter 7
Posts: 103
Join Date: Oct 2009
Location: Dunedin, Florida
Quote:
Originally Posted by travisjames View Post
At which part does the sdcard have to be mounted?

During this part?:
Code:
dd if=/dev/block/mmcblk0p17 of=/sdcard/misc.img
I guess that would make sense, but I didn't have to have my SD Card mounted during this part which makes me wonder.

Quote:
Originally Posted by travisjames View Post
1. Download the ROM and rename to PD15IMG.zip
2. Place PD15IMG.zip on the root of your SD card
3. Un-mount SD Card
4. adb shell
5. su
etc......
step 3 ignore

Quote:
Originally Posted by travisjames View Post
12. Now save as miscnew.img
13. Unmount your SD Card now
14. Now in adb shell run this command:
etc......
step 13 ignore
Device: T-Mobile myTouch4g (Black) - Rooted 11/09/2010
Rooted: Permaroot
ROM: febycv's ICS 4.0.3 .: :: Creamed Glacier :: :. with Ultimate Online Theme Kitchen
Throttle Fix: APN Settings
Modding: Android Commander, Droid Explorer
Kitchen: Dsixda's HTC Android Kitchen's Latest
SPL: 0.85.2007
Radio:12.62.60.27_26.13.04.19
Recovery: madmaxx82's 4Ext Recovery Touch
SD Card: WinTec 16GB MicroSD class 10

Device: T-Mobile myTouch3g (Black) - Retired
 
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Mr Bill Florida 		Old
8th November 2010, 02:54 PM
#10  
Senior Member
Thanks Meter 7
Posts: 103
Join Date: Oct 2009
Location: Dunedin, Florida
Quote:
Originally Posted by travisjames View Post
I would like to note that this downgrades the HBoot/Bootloader, radio, system, data, amongst other partitions of your phone.
Also, since I downgraded, I have not received any notifications for the OTA as of 11/8/10.
When I received my update to 2.2.1 it was over 5 hours after I activated the phone. Might take as long or longer depending on the network.
Device: T-Mobile myTouch4g (Black) - Rooted 11/09/2010
Rooted: Permaroot
ROM: febycv's ICS 4.0.3 .: :: Creamed Glacier :: :. with Ultimate Online Theme Kitchen
Throttle Fix: APN Settings
Modding: Android Commander, Droid Explorer
Kitchen: Dsixda's HTC Android Kitchen's Latest
SPL: 0.85.2007
Radio:12.62.60.27_26.13.04.19
Recovery: madmaxx82's 4Ext Recovery Touch
SD Card: WinTec 16GB MicroSD class 10

Device: T-Mobile myTouch3g (Black) - Retired
 
REPLY
Tags
downgrade, guide, ota, upgrade
 
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