Gigaset gs 270 plus development, rooting, flashing, roms - Android Q&A, Help & Troubleshooting

hello all
i have a gigaset GS 270 plus, and everything i try to do on it fails
i backed up the data on my sd card using the recovery , but on restoring on an identical phone (trait for trait) it says "the backup file is out of date please rebackup your data
on the source phone i tried the same process and it went on smoothly but i cant risk formating, rooting , enabling adb, restoring and removing pasword because of the above problem.
i have 13 backup files of up to 25 gigabytes which i am unable to recover or decrypt on a pc even following the commands given on linux from this thread
https://forum.xda-developers.com/showthread.php?t=2408788&page=2
the phone connects in fastboot mode but not in adb mode
Fortunately it is a mediatek device and i have tried to back up the rom using this tutorial
https://android.stackexchange.com/q...nd-full-rom-without-root-for-mediatek-devices
but all to no avail
i tried a readback of my rom using help from @Alecxs using WwR MTK v2.51 from Ilya Aleksandrovich
but upon creating the scatter file it gives an error
https://ibb.co/Sd3HTfM
please i need anyhelp whatsoever to recover the files from the phone either by a readback or by unlocking the phone or any other method which i have not thought of
Thank you in advance!!!

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search for stock ROM, use that preloader.bin

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https://forum.xda-developers.com/showthread.php?t=3775129
https://forum.xda-developers.com/showthread.php?t=3899918

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yet another instructions for exactly the same like the link you shared
how to create scatter file
https://forum.xda-developers.com/ap...v1-universal-systemless-t3432382/post77795016

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aIecxs said:
search for stock ROM, use that preloader.bin
Click to expand...
Click to collapse
yeah, i thought of that too
i already tried searching but i was unable to find any rom except click baits

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aIecxs said:
https://forum.xda-developers.com/showthread.php?t=3775129
https://forum.xda-developers.com/showthread.php?t=3899918
Click to expand...
Click to collapse
thank you let me try

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Maybe that device has secure boot preventing SP Flash Tool from readback, try another download agent
we can help you porting TWRP but we can't help on readback, you are the only one who has physical access. if you follow the tutorial and it fails, maybe the tutorial is not working for this device
if you are using windows 10, try another PC with Windows 7 or try SP Flash Tool for Linux
edit: there are other methods for creating scatter file. post the output of fastboot getvar all

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belvo02 said:
aIecxs said:
No, except you do a readback of metadata from SP Flash Tool. Note when login credentials are involved in encryption, you won't be able to decrypt even on rooted device
port TWRP recovery from Cubot X18 Plus and flash on locked bootloader, that's (besides official solutions) your best option to remove screen lock
Click to expand...
Click to collapse
do you have any suggestions for me?
i want to try dr fone but i dont think it supports gigaset smatphones
i need a method to remove the screen lock without loosing the data ,:sad:
i even got the same phone , i was planning to root it , restore the backup and then use twrp to remove the lock
but it says "the backup file is out of date please rebackup your data"
any method to recover this files s welcome, if i could get even just the pictures and videos, can any thing help me?
im going to try to connect it to sp flashtools and try what you said earlier
thank you for replying
Click to expand...
Click to collapse
you have two devices of same model? great, let's root the spare phone!
take away the source phone for now (the important one)
Do on the target phone only:
WARNING: factory reset - all data lost!
1) unlock the bootloader
- enable developer options by tapping build number seven (7x) times (in settings - about phone)
- enable OEM unlocking in developer options
- install platform-tools and connect device to PC in fastboot mode (Volume Down + Power)
- install usb drivers and check usb connection (from platform-tools directory in cmd.exe)
- unlock bootloader and confirm with Volume Up (factory reset)
Code:
fastboot devices
fastboot flashing unlock
fastboot reboot
2) temporary root device
- enable developer options
- enable usb-debugging
- connect to PC and install usb drivers
- check adb devices (from platform-tools directory in cmd.exe)
- on the phone display permanently authorize the incoming RSA key
- download mtk-su to PC
- adb push binary to /data/local/tmp
- chmod executing permissions
- run the binary until you see # prompt (multiple times)
Code:
adb push mtk-su /data/local/tmp
adb shell
cd /data/local/tmp
chmod 0755 mtk-su
./mtk-su
3) backup boot.img / recovery.img
- get list of partitions
- dump partitions into files (in # shell)
- copy files to Internal storage
- copy files to PC (via MTP)
Code:
ls -d $(find /dev/block -name by-name)/*
cat /dev/block/platform/mtk-msdc.0/11120000.msdc0/by-name/boot > boot.img
cat /dev/block/platform/mtk-msdc.0/11120000.msdc0/by-name/recovery > recovery.img
cp -v *.img /sdcard
4) root device with Magisk Manager
- install Magisk Manager
- open the app
- advanced settings - preserve force encryption
- keep avb/dm-verity
- tap install (2x) times
- select and patch a file - boot.img
- copy magisk_patched.img to PC
- reboot into fastboot
- flash the patched boot
Code:
fastboot flash boot magisk_patched.img
fastboot reboot
5) create your own TWRP recovery
... to be continued
(send me recovery.img will try to make TWRP and you can test)
edit: please do not full quote this post (i want update later). i will receive instant notification for answer button as well

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aIecxs said:
you have two devices of same model? great, let's root the spare phone!
take away the source phone for now (the important one)
Do on the target phone only:
WARNING: factory reset - all data lost!
1) unlock the bootloader
- enable developer options by tapping build number seven (7x) times (in settings - about phone)
- enable OEM unlocking in developer options
- install platform-tools and connect device to PC in fastboot mode (Volume Down + Power)
- install usb drivers and check usb connection (from platform-tools directory in cmd.exe)
- unlock bootloader and confirm with Volume Up (factory reset)
Code:
fastboot devices
fastboot flashing unlock
fastboot reboot
2) temporary root device
- enable developer options
- enable usb-debugging
- connect to PC and install usb drivers
- check adb devices (from platform-tools directory in cmd.exe)
- on the phone display permanently authorize the incoming RSA key
- download mtk-su to PC
- adb push binary to /data/local/tmp
- chmod executing permissions
- run the binary until you see # promt (multiple times)
Code:
adb push mtk-su /data/local/tmp
adb shell
cd /data/local/tmp
chmod 0755 mtk-su
./mtk-su
3) backup boot.img / recovery.img
- get list of partitions
- dump partitions into files (in # shell)
- copy files to Internal storage
- copy files to PC (via MTP)
Code:
ls -d $(find /dev/block -name by-name)/*
cat /dev/block/platform/mtk-msdc.0/11120000.msdc0/by-name/boot > boot.img
cat /dev/block/platform/mtk-msdc.0/11120000.msdc0/by-name/recovery > recovery.img
cp -v *.img /sdcard
4) root device with Magisk Manager
- install Magisk Manager
- open the app
- advanced settings - preserve force encryption
- keep avb/dm-verity
- tap install (2x) times
- select and patch a file - boot.img
- copy magisk_patched.img to PC
- reboot into fastboot
- flash the patched boot
Code:
fastboot flash boot magisk_patched.img
fastboot reboot
5) create your own TWRP recovery
... to be continued
(send me recovery.img will try to make TWRP and you can test)
Click to expand...
Click to collapse
thanks im on it!

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Thanks a lot @aIecxs for the posting, tried with a Gigaset GS270 but the mtk-su is not working:
1|Gigaset_GS270:/data/local/tmp $ ./mtk-su -v
Failed critical init step 1
Any workaround to get this device rooted?
Best regards