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Hi,All,

It works!! I did it!!

Just flash my boot.img into you T760 or P71 , the /system will FULL writable!!

At this time , pls download from Rk29xx's Writeable System V4

If you have any question , free to ask.

Notice :
1. Atfer flash , and reboot , you must wait at least 5 min !! Just take a rest !!
2. ONLY Boot.img need to be flash !!
3. If it work , ALL your datas will keep.
4. It is FULL rooted system ,and writeable system, you can edit any file in /system and /data !!

Boot.img for T760 https://docs.google.com/leaf?id=0B8hUXYDeoy_hYjdjNzYwN2UtMTk5Ny00MDI2LWI2OTctNGE0NzY1Njc5MGI2&hl=zh_CN
Tools v4.1 : https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0B8hUXYDeoy_hOWIwZjgzNmEtZTUyZi00OGY4LWE0NjUtMDc2ZTJjMjc1MGE2&hl=zh_CN
 

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Thanks Wendal for the update, been following the update from teclast forum.

What is the difference from v3 posted earlier? I am using v3, the earlier boot.img was like 206kb in size.

Thank you so much Wendal, you are the man


Do we still need to have 2.08 version installed for flashing your modded boot.img or now work with any other fw version?
This tested on 2.08, not too sure if boot.img from 2.08 can work with earlier firmware. Well I think you could try it, if there is any problem just use restore with latest flash tools using latest firmware should reset everything to pre-writable system.
 

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Hi All,

Thanks Wendal.

Noticed that boot.img of T760 2.08 from Rk29xx's Writeable System V3 is only 200+ kb.
But Rk29xx's Writeable System V4 and V4.1 is 1.18mb.

Wendal , may I know the differences between this two boot.img files? ( Question from kpf91 )
 

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Discussion Starter · #8 ·
This is the change history:
V1.0
system writeable , but not rooted system -- a bat file ,adb , modified boot.img ,and upgrade tool

V2.0
just some words change

V3.0
system writeable , rooted system -- a bat file ,adb , modified boot.img , and upgrade tool

V4
system writeable , rooted system -- modified boot.img , and upgrade tool

Diff V4 to V3
1. Just flash a modified boot.img into you T760 , it will work . without any bat file , adb push , etc..
2. If you clean all data (use fatory reset), V4 can work , But V3 will fail to power on .

Why V4 can do this?
Because I found a smart way to do :
1. mount system partition to /sysro
2. add a new service to call /init.sh
3. In init.sh
#!/busybox sh

if [ ! -e /data/sysrw/TAG ]; then
/busybox mkdir /data/sysrw
/busybox cp -r /sysro/* /data/sysrw/
/busybox touch /data/sysrw/TAG
/busybox cp /su /data/sysrw/bin/
reboot
fi
############################
As you see , I will check file /data/sysrw/TAG , if it is exist, It means isn't first boot
then , if it is first-boot, cp all files in /sysro/ to /data/sysrw/ ,and then root -- this setp will take 5 min !!

So , After you flash V4 boot.img , and power on the T760 , it will check and cp the files

in init.rc , I change the mount cmdline of data partition , so the system is FULL rooted.
BTW, have no more need of Superuser.apk

So, V4 is best version for you , by now.

about compatibility
2.0.8 and 2.0.7 is test by me , and some user report that 2.0.3 work perfect
 

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Hi Wendal,

(1) Can you check and see if your method works on the Cube U8GT /U9GT firmware? They are also rk2918 tablets I guess using cramfs.

Cube firmware download

(2) Can you also post the steps to remove system apps using your rk29xx image tool?

I am interested in buying a Cube U8GT if your rooting and r/w process works. Thanks.
As far as I know , Cube U9GT's /system is writeable!! But don't use official rom!!
Use this http://www.yuandaocn.com/down/N%E7%B3%BB%E5%88%97/N10/
because yuandao and Cube use the some hardware, Yuandao's official rom , embedded aufs module .

I will check U8GT later

About "remove system apps using your rk29xx image tool":
1. first unpack the image
2. check folder /system/app/ , all app are in there, remove anything as you want
3. repack the image
 

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Great work! Very nice and clean method indeed.
Thanks again!

I wonder if there is any tools to unpack recovery.img at this moment? this shows promise as we could do update of /system via recovery(maybe using a clockwork recovery mod?) and other like boot.img or kernel.img via rockchip tools.

This is the change history:
V1.0
system writeable , but not rooted system -- a bat file ,adb , modified boot.img ,and upgrade tool

V2.0
just some words change

V3.0
system writeable , rooted system -- a bat file ,adb , modified boot.img , and upgrade tool

V4
system writeable , rooted system -- modified boot.img , and upgrade tool

Diff V4 to V3
1. Just flash a modified boot.img into you T760 , it will work . without any bat file , adb push , etc..
2. If you clean all data (use fatory reset), V4 can work , But V3 will fail to power on .

Why V4 can do this?
Because I found a smart way to do :
1. mount system partition to /sysro
2. add a new service to call /init.sh
3. In init.sh
#!/busybox sh

if [ ! -e /data/sysrw/TAG ]; then
/busybox mkdir /data/sysrw
/busybox cp -r /sysro/* /data/sysrw/
/busybox touch /data/sysrw/TAG
/busybox cp /su /data/sysrw/bin/
reboot
fi
############################
As you see , I will check file /data/sysrw/TAG , if it is exist, It means isn't first boot
then , if it is first-boot, cp all files in /sysro/ to /data/sysrw/ ,and then root -- this setp will take 5 min !!

So , After you flash V4 boot.img , and power on the T760 , it will check and cp the files

in init.rc , I change the mount cmdline of data partition , so the system is FULL rooted.
BTW, have no more need of Superuser.apk

So, V4 is best version for you , by now.

about compatibility
2.0.8 and 2.0.7 is test by me , and some user report that 2.0.3 work perfect
 

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As far as I know , Cube U9GT's /system is writeable!! But don't use official rom!! Use this http://www.yuandaocn...B%E5%88%97/N10/ because yuandao and Cube use the some hardware, Yuandao's official rom , embedded aufs module . I will check U8GT later.

About "remove system apps using your rk29xx image tool": 1. first unpack the image 2. check folder /system/app/ , all app are in there, remove anything as you want 3. repack the image.
Thank you Wendal for your hard work! I'll take a chance and order the U8GT.
 

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Discussion Starter · #14 ·
WARNING, Some user report : Upgrade from V3 to V4.1, T760 will keep reboot!!

Before you upgrade from V3 to V4.1, create a file name /data/sysrw/TAG first!!

Sorry!!

=================================================================================

Yes , there is a tools can unpack/repack recovery.img :
rk29打包解包工具ultra1.7.rar
This is a tool dev by a team call "RK28 Team"

But I am not sure that modify recovery.img will help.
 

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Hi Wendal,
I have a U8GT. In order to make the system writable, do I only need to
1. unpack the image,
2. replace the boot.ini with the boot.ini from v4
3. repack the image

Are these the steps or am I missing something?

Thank you so much!

Methaq
 
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