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Step by Step How-To get Modify RC30

348 posts
Thanks Meter: 5
By usmc2k, Senior Member on 9th November 2008, 01:09 PM
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Per "JesusFreke"
"I saw someone post this over on saurik's G1-hackers mailing list, and thought it would be useful to some of you.

It gives complete step-by-step instructions (all 23 of them ) for going from RC30 to JFv1.3.
"Whether You Think You Can or Can't, You're Right"
--Henry Ford

T-Mobile G1 - modified RC30 with root access !!!
Last edited by Mikey; 3rd January 2009 at 08:54 PM.
9th November 2008, 01:09 PM |#2  
usmc2k's Avatar
OP Senior Member
Thanks Meter: 5
Post ANOTHER Step by Step How-To get Modify RC30
Per user- "brandenk"
I think you need root to make the changes which is why you need to downgrade from RC30 to RC29 to take advantage of the root bug.

To downgrade using this NBH file:
To gain root access:
To flash the recovery and install modified rc30:
Engineering bootloader for G1:

Follow those steps, for #2 you dont need to do the beatbox mod and for step #3 use JKv1.3 instead of 1.2, then I added a step, flashing the Engineering Bootloader. Once you do those steps you will be good to go, I did this for the first time ever last night following those directions and it worked for me, and thats with my changes to the process. It took me reading through the directions like 50 times before I tried it but I went slowly and carefully and it went flawlessly.
Last edited by Mikey; 3rd January 2009 at 08:53 PM.
9th November 2008, 01:09 PM |#3  
usmc2k's Avatar
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Post Step by Step How-To get Modify RC30
I would like to give thanks to JesusFreke who helped me to understand this process !!!! Please show him some love and make good gestures for his work….. Also to all the other people and sites who made this possible including Koush !!! I take no credit for this just posting it to help people like me, who dont know to much about this.

First…. You need to install a google android usb driver so you can use the adb program. (It lets you push and pull files to/from the phone, and you can open up a shell with it to).

Download the driver file ( and
unzip it to the desktop.

On ur G1… Go menu > Settings > Applications > Development then enable the
USB debugging button.

Then connect your Android device via USB. When the Found New Hardware Wizard
appears, you'll be asked if you'd like Windows Update to search for software,
select No, not this time and click Next. Select Install from a list or specified location
and click Next. Select Search for the best driver in these locations. Browse and
select the unzipped file (android usb Click Finish.

Second…. Setting up the SDK

Go to and download the

Unzip the file to the desktop and rename the folder to sdk

Open your command prompt (Windows Key and R)

Type “cmd” (Without the quotations)

Then "cd desktop"

Then “cd sdk”

Next “cd tools”

Now type “adb devices

After that it should say some thing like… List of devices attached HT845GZ21370
Device. If u see this abd sees your device.

Third…. Writing JesusFreke’s Recovery image

Download the zip file from this thread...

Unzip the files to the SDK tools folder

Now, in the command window, type
"adb push recovery_testkeys.img /data/local/recovery.img"
(This will copy the recovery image files to the phone)

Fourth…. Get Root working on ur G1

Download the Android Telnet Client from the Market or get it here…

Turn on your phone's WiFi. This gives your phone an IP you can reach it at.

Restart your phone

Once restarted type telnetd at the home screen and press enter – Yes….. it will
start up a Contact search, do not worry about this, just type “telnetd” and press
enter (the enter button on the keypad).

Now press connect to localhost……. (You now have root!)

Now put in this command….
“mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system”

Then “cd /system”

Then “cat /data/local/recovery.img > recovery.img”

Finally “flash_image recovery recovery.img” (Your Recovery Image is now writen)

*To make sure your Recovery Image was written…. Reboot your phone in Recovery
mode and press Alt+L. At the top it should say "using test keys" If so its written. Go
ahead and Reboot your phone by pressing the Home and Back buttons.*

Fifth…Apply JesusFreke’s modified RC30/RC8/ADP1

Go here and Download the ZIP

Now once the ZIP is downloaded rename it to “UPDATE”

Put it on the storage card

Last but not least Power off your G1 and Power it on by pressing the home key and power key

Press Alt+L (to turn on text)

Press Alt+S (to update)

And Bam you have yourself a modded RC30 G1 !!!!!!!!
Last edited by Mikey; 26th January 2009 at 11:16 PM.
9th November 2008, 01:23 PM |#4  
Senior Member
Thanks Meter: 1
Thanks for the step by step instructions. Been looking for something like this!
9th November 2008, 02:16 PM |#5  
Thanks Meter: 1
would i get brick if i unlock it with a code for ATT?
9th November 2008, 03:48 PM |#6  
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step three link should be the following:

thanks for the walk through
9th November 2008, 04:50 PM |#7  
Senior Member
Thanks Meter: 21
also the link for the modded RC30 is:
9th November 2008, 04:51 PM |#8  
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I did this last night and upgraded to RC30 but the problem is right before I started the original RC30 was downloaded and it was asking me to update my phone but I declined. So now after everything is done, is there a way I could tell if I have the modded RC30 or the original RC30?
9th November 2008, 05:09 PM |#9  
chasmanian's Avatar
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will this work even if your phone has already been updated to the stock rc30?
9th November 2008, 05:10 PM |#10  
humble's Avatar
Senior Member
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i dont think so. because they patched it
Last edited by humble; 9th November 2008 at 05:13 PM.
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