Save files from Samsung Galaxy S4 with a dead screen with Debian or Ubuntu

How to download your files and safely destroy personal data from a Samsung android phone with a dead screen using heimdall, TWRP, and adb.
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During our incredibly long, 5 days vacation, on the very first day Nora's Galaxy S4 fell and with this final, rather heavy crack, the screen went completely dead. For my surprise, the phone itself was working well, given it woke us up at 4 am, which was slightly unexpected.

Normally I have my laptop paired with ADB, but due to recent laptop changes I forgot this step, so I was left without any connection to the phone, as MTP requires the screen to be unlocked.

Plugging in an external display with an MHL cable didn't work either, so I decided to flash a custom recovery and try to pull via adb - for my surprise, it worked.

Get Heimdall and adb

All commands are executed as root.

You'll need the following on Debian:

apt install heimdall-flash android-tools-adb

Normally, instead of heimdall, it would be fastboot, but not for a Samsung phone.

Flash TWRP recovery in Odin mode

  • disconnect USB
  • remove battery
  • insert battery
  • Hold volume down + power until it vibes for 1 time
  • press volume up.
  • connect the USB cable

See if the device is visible:

heimdall detect
    Device detected

If you're good to go, get the TWRP recovery; in my case, the device is an i9505, codenamed 'jfltexx'.

Make sure you're getting the right image for your device model.

cd /tmp

When you have the image, flash it:

heimdall flash --RECOVERY /tmp/twrp-3.1.1-0-jfltexx.img --no-reboot

When you're using --RECOVERY, there is no need to download the PIT file and to look for the recovery partition.

  • remove USB
  • remove the battery

Boot recovery

  • hold volume up + power until it vibes
  • release power immediately
  • keep holding volume up for 1-2s more

Verify you have connection: (it takes a few seconds for recovery to boot, be patient)

adb usb
adb devices
    List of devices attached
    d910339a        recovery

Save the data

adb pull -a /sdcard/ /where/you/want/to/save/

This can take a while; also, make sure you have enough space on the device you're saving to.

Wipe the personal data

adb shell
twrp wipe data
twrp wipe cache
twrp wipe dalvik
reboot recovery

The last step reboots the device back to recovery; that is to make sure there is no cached filesystem data.

Once it's back:

adb shell
ls -la /sdcard
drwxrwx---    3 media_rw media_rw      4096 Jan  1 00:25 .
drwxr-xr-x   24 root     root             0 Jan  1 00:28 ..
drwxrwxrwx    2 root     root          4096 Jan  1 00:25 TWRP

ls -la /data/
drwxrwx--x    4 system   system        4096 Jan  1 00:16 .
drwxr-xr-x   24 root     root             0 Jan  1 00:28 ..
-rw-------    1 root     root             2 Jan  7  1970 .layout_version
drwxrwx---    2 root     root          4096 Jan  7  1970 lost+found
drwxrwx---    5 media_rw media_rw      4096 Jan  7  1970 media

If it's all clear, it's safe to put it up for a £0.99 auction on eBay.