Bricked j500fn

Hi Guys,

I generally make do with all of the older threads (and google), but for this I just
had to make an account and ask if there is some saving possible.

I reinstalled (Flashed) the stock rom for the J5 (with ODIN), rooted the phone using j5nlte Auto Root.
flashed TWRP and then MOAB & SuperSu. This is where something seemed to go wrong
as TWRP asked me again if I wanted to install SuperSu when exiting. Stupidly I swiped
instead of choosing no. This is where my phone ended up in a bootloop to TWRP.

Now my first reaction was, okay no biggie i'll just wipe the phone and start over again. All of a sudden
Odin can't recognize the phone when I reboot into bootloader, because it doesn't go into the normal
Samsung DOWNLOAD MODE anymore, I get the following if I choose to reboot into bootloader

ODIN MODE
Product name: SM-J500FN
Current Binary: Custom
System Status: Custom
FRP Lock: Off
Knox warranty void: 0x1 (4)
RP SWREV: S1, T1, H1 R1, A1, P1
Secure Download: Enable

the pc doesn't recognize it in this state.

In TWRP it adb does recognize it. It seems to recognize adb commands.

tried the following

adb shell
killall -19 recovery
make_ext4fs /dev/block/mmcblk0p8
reboot

but it gives me an error message: failed to allocate 910 blocks, out of space?

anymore options?

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