Cannot root on LTE SGP771

[Wei Xu]

I'm going to upgrade it to MR, but i can't have it root after try whole the night, i tried
AndroPlusKernel v4 and v10 but none of them did the work, what i'm following is successfully verified by a few people, can some help on this?

I'm a HK version with '28.0.A.8.260' firmware.

Here is my command output.
#[email protected]:/ $ su
/system/bin/sh: su: not found

#[email protected]:/ $ reboot bootloader

#fastboot devices
CB5A26CPBC fastboot

#fastboot oem unlock **************
...
FAILED (remote: Device is already rooted)
finished. total time: 0.008s

# fastboot flash boot boot.img
sending 'boot' (40420 KB)...
OKAY [ 0.996s]
writing 'boot'...
OKAY [ 0.330s]
finished. total time: 1.325s

#fastboot reboot
rebooting...
finished. total time: 0.060s

#adb shell
[email protected]:/ $ su
/system/bin/sh: su: not found

 

[jelbo]

DId you also flash the TWRP recovery from AndroPlus? Also, from there you need to flash the SuperSU 2.46 .zip file.

 

[Wei Xu]

DId you also flash the TWRP recovery from AndroPlus? Also, from there you need to flash the SuperSU 2.46 .zip file.

Thanks a lot for your help.

No, the link what i'm following tells it's enough by just unlock and flash the boot.img.

I tried flashing TWRP, but i can never boot into recovery mode both by hold the 'Volume -' and 'Power' button or by executing 'adb reboot recovery', the display never light up and will go to normal boot after a while, looks like the flash don't make sense, is it possibly caused by the firmware version? i'm at 28.0.A.8.260.

# fastboot flash recovery ../TWRP-2.8.7.0_adb_shell_only.img
sending 'recovery' (11653 KB)...
OKAY [ 0.315s]
writing 'recovery'...
OKAY [ 0.123s]
finished. total time: 0.438s
# fastboot reboot
rebooting...
finished. total time: 0.052s
[[email protected] Root-img-v10]# adb reboot recovery

 

[DHGE]

get the latest recovery from Androplus' website - the shell only thing was a first attempt

as jelbo writes you need to flash SuperSU

adb reboot recovery is OK if volume up does not work on device normal boot

 

[killdozer56]

Thanks a lot for your help.

No, the link what i'm following tells it's enough by just unlock and flash the boot.img.

I tried flashing TWRP, but i can never boot into recovery mode both by hold the 'Volume -' and 'Power' button or by executing 'adb reboot recovery', the display never light up and will go to normal boot after a while, looks like the flash don't make sense, is it possibly caused by the firmware version? i'm at 28.0.A.8.260.

# fastboot flash recovery ../TWRP-2.8.7.0_adb_shell_only.img psending 'recovery' (11653 KB)...
OKAY [ 0.315s]
writing 'recovery'...
OKAY [ 0.123s]
finished. total time: 0.438s
# fastboot reboot
rebooting...
finished. total time: 0.052s
[[email protected] Root-img-v10]# adb reboot recovery

Hi,
Don't use the recovery TWRP-2.8.7.0_adb_shell_only.img but use the twrp 2.8.7.0(not)fixed.img. Shut down the tablet
Press and old down the power button when the light become yellow press volume down button the led become orange released the power button and volume down button. The twrp screen must be appear

 

[Wei Xu]

Hi,
Don't use the recovery TWRP-2.8.7.0_adb_shell_only.img but use the twrp 2.8.7.0(not)fixed.img. Shut down the tablet
Press and old down the power button when the light become yellow press volume down button the led become orange released the power button and volume down button. The twrp screen must be appear

Great, this is caused by the recovery.img version, i tried 2 other img in official link, both of them failed,
'(not)fixed' works well.

when i used TWRP to install the MR ROM, it refused to continue with 'could not find 'META-INF/com/google/android/update-binary' like error.

so i unzip the ROM and booted to recovery mode to make a manual flash, but it hangs up for 15 minutes and stills don't finish, is this abnormal? should i wait for it to complete? does it will crash the system if i terminate it forcely?

I had brush CM 12 on an OnePlus One before, looks it's very fast and often finished within 10 mins, what's the matter?

# fastboot flash system system.img
sending 'system' (859570 KB)...

 

[jelbo]

when i used TWRP to install the MR ROM, it refused to continue with 'could not find 'META-INF/com/google/android/update-binary' like error.

so i unzip the ROM and booted to recovery mode to make a manual flash, but it hangs up for 15 minutes and stills don't finish, is this abnormal? should i wait for it to complete? does it will crash the system if i terminate it forcely?

What is this MR ROM you speak of? There is no such thing as MR ROM for the Z4 Tablet. Afaik we only have AOSP 5.02, 5.1.1, 6.0 and the latest stock 5.0.2 ROM. Flashing anything else would likely end up in it hanging, like you experience.

With the current state of ROMs, I advice to just flash the official stock ROM, benefit from it's stability and full copmpatibility, SuperSU it, try Xposed (v79, sdk21, arm64) and freeze/uninstall system bloatware with an app like Titanium Backup.

 

[Wei Xu]

What is this MR ROM you speak of? There is no such thing as MR ROM for the Z4 Tablet. Afaik we only have AOSP 5.02, 5.1.1, 6.0 and the latest stock 5.0.2 ROM. Flashing anything else would likely end up in it hanging, like you experience.

With the current state of ROMs, I advice to just flash the official stock ROM, benefit from it's stability and full copmpatibility, SuperSU it, try Xposed (v79, sdk21, arm64) and freeze/uninstall system bloatware with an app like Titanium Backup.

OK, MR is MarshMallow, i did see someone has made an AOSP ROM works and i'm eagerly to have a try, i terminate it forcely and now it hangs on 'starting apps', looks it's already upgraded because i lose
adb connection, anyway to rescue this?