ok, preparing the cable was very easy. Now i have a dump of 3 files, boot, system and userdata.
will continue with magisk manager later, i found this guide:
You would want to choose this method if either your device does not have custom recoveries, your device is A/B and you don’t want to mix recovery and boot images, or your device is using system-as-root without A/B partitions.
To use this method, you are required to obtain a copy of the stock boot/recovery image, which can be found by extracting OEM provided factory images or extracting from OTA update zips. If you are unable to obtain one yourself, you might be able to find it somewhere on the internet. The following instructions will guide you through the process after you have the copy of boot/recovery image.
Copy the boot/recovery image to your device
Download and install the latest Magisk Manager
If you are patching a recovery image, manually check “Recovery Mode” in Advanced Settings!
Press Install → Install → Select and Patch a File, and select your stock boot/recovery image file
Magisk Manager will patch the image, and store it in [Internal Storage]/Download/magisk_patched.img
Copy the patched image from your device to your PC. If you can’t find it via MTP, you can pull the file with ADB:
adb pull /sdcard/Download/magisk_patched.img
Flash the patched boot/recovery image to your device and reboot. For most devices, here is the fastboot command:
fastboot flash boot /path/to/magisk_patched.img or
fastboot flash recovery /path/to/magisk_patched.img if you are patching a recovery image
is there something else i have to consider?
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