I have proccured myself the Samsung official firmware (here). This image
allow me to get back during beetwen the experimentations. I tried several
experimentation and restore the device after each fail.
Installing with Odin the Clockworkmod (CWM) for SM-T110 , for SM-T210, and
SM-T211. (Has preconnised here) Each time, when loading the CWM, I got a little
(1 ascii character) exclamation mark at the top-left of the screen. The device
didn't boot on recovery
Installing with Odin the (TWRP) for SM-T110. Same symptom
Installing philz_touch : against the message with only the red exclamation
mark.
I conclude of checked of some signature before executing recovery.
Using Kingo root application : software try to root during 20 minutes and
finaly fail.
Using Towel root application : The device isn't reconized
Conclusion: Security breach for rooting have been fixed in this version of android
I have downloaded UPDATE-SuperSU-v2.46 for android. The idea is to push this
application by the standart android update way. (native recovery).
Sending the zip archive 'as is' => failure to check the whole archive
Re-sign the archive with the autosign tools => failure to check footer of archive
Rewriting the update-script (see here) and (here) and auto-sign the archive
: failure to check footer
I am procured myself some pre-rooted image. Odin fail to import them. (and I
have no succed to use heimdall for linux on my debian)
I have try to improve the official samsung Image by adding root manually , using
simg2img and make_ext4fs. Odin fail at the same point
It's remaining me two way : Or I try to generated a correct update file, or I
try to understood why odin fail to import prerrooted system and my custom
image. I choosed the second option.
The offical update is splited by several blocks, each block having is own
header. A master header provide global information about the image (number of
blocks, size, ...). I have putting some spies in simg2img and
observate the headers of official update and of my custom uptate. Result is
surprising : It is missing 4 bytes by headers. in custom update. According to
samsung orginal update, missing values seem to be constant. I suppose it's a 'magic
number', checked by the device to be sure the 'good' update is applied. So I
modifed this headers in make_ext4fs for adding the missing constants. My custom update is now
accepted by my devices, and I got root (!)
Je pense que cela suffit pour la root non ?^^
..