Messed up, PBP does not start after write_spi_flash

[bnjmnhg]

Ok, I'm a few steps further.
rkdeveloptool seems to work now. But it tells me, no device is connected.
The device is connected via USB-A_to_USB-Cable. USB-C on PBP side.
It was also automatically mounted. But I have no idea if this is right.

Code:

~/code/rockchip/rkdeveloptool$ dd if=/dev/zero of=zerospi bs=1M count=16
16+0 records in
16+0 records out
16777216 bytes (17 MB, 16 MiB) copied, 0,0645965 s, 260 MB/s
~/code/rockchip/rkdeveloptool$ ./rkdeveloptool db rk3399_loader_spinor_v1.15.114.bin
Did not find any rockusb device, please plug device in!
~/code/rockchip/rkdeveloptool$ cd /media/vonderhaarb/e9e67d6e-9693-4f25-bbd6-ae24f7c9e5bb/
/media/vonderhaarb/e9e67d6e-9693-4f25-bbd6-ae24f7c9e5bb$ ll
total 513452
drwxr-xr-x   20 root root      4096 Jul 11  2019 ./
drwxr-x---+   7 root root      4096 Apr  4 21:45 ../
drwxr-xr-x    2 root root      4096 Mär 25 13:20 bin/
drwxr-xr-x    2 root root      4096 Jun 26  2018 boot/
drwxr-xr-x    4 root root      4096 Sep 12  2018 dev/
drwxrwxr-x  114 root root      4096 Mär 26 13:45 etc/
drwxr-xr-x    5 root root      4096 Jul 11  2019 home/
drwxr-xr-x   13 root root      4096 Jul  2  2019 lib/
drwx------    2 root root     16384 Feb 22  2019 lost+found/
-rw-r--r--    1 root root   1385163 Sep 12  2018 md5sum.txt
drwxr-xr-x    4 root root      4096 Mär 26 08:52 media/
drwxr-xr-x    2 root root      4096 Sep 12  2018 mnt/
drwxr-xr-x    2 root root      4096 Jun 26  2018 proc/
drwx------   22 root root      4096 Jul 14  2019 root/
drwxr-xr-x    5 root root      4096 Feb 22  2019 run/
drwxr-xr-x    2 root root      4096 Mär 25 13:20 sbin/
drwxr-xr-x    2 root root      4096 Sep 12  2018 srv/
-rw-------    1 root root 524288000 Jul  3  2019 swapfile
drwxr-xr-x    2 root root      4096 Jun 26  2018 sys/
drwxrwxrwt   11 root root      4096 Apr  3 20:51 tmp/
drwxr-xr-x   11 root root      4096 Mär 10  2019 usr/
drwxr-xr-x   11 root root      4096 Aug 16  2019 var/

Id tried it again (This time with the USB-Cable pluged in before pushing the buttons, something changed:
1. The annoying beeping stopped. The Power-LED (Wich was red) switched off.
2. The boot volume is no longer mounted
3, Rkdeveloptool says something different.

Code:

~/code/rockchip/rkdeveloptool$ ./rkdeveloptool db rk3399_loader_spinor_v1.15.114.bin
Opening loader failed, exiting download boot!

Looks like the PBP is just off. :-(