hp-firmware does not update the firmware on my cp1525nw

Hello,

I try to update the firmware of my cp1525nw, since it does not calibrate anymore and HP support forums recommend to upgrade firmware in these cases (among other things). My cp1525nw is USB connected:

rd@blackbox:~$ hp-firmware -i -d hp:/usb/HP_LaserJet_CP1525nw?serial=00CNC3212487

HP Linux Imaging and Printing System (ver. 3.14.6)
Firmware Download Utility ver. 2.4

Copyright (c) 2001-13 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

error: No device selected/specified or that supports this functionality.
rd@blackbox:~$

Output of hpcheck -t:

rd@blackbox:~/Ablage/Software/ETS5/Full$ hp-check -t
Saving output in log file: /home/rd/Ablage/Software/ETS5/Full/hp-check.log

HP Linux Imaging and Printing System (ver. 3.14.6)
Dependency/Version Check Utility ver. 15.1

Copyright (c) 2001-13 Hewlett-Packard Development Company, LP
This software comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to distribute it
under certain conditions. See COPYING file for more details.

Note: hp-check can be run in three modes:
1. Compile-time check mode (-c or --compile): Use this mode before compiling the HPLIP supplied tarball (.tar.gz or .run) to determine if the proper
dependencies are installed to successfully compile HPLIP.
2. Run-time check mode (-r or --run): Use this mode to determine if a distro supplied package (.deb, .rpm, etc) or an already built HPLIP supplied tarball
has the proper dependencies installed to successfully run.
3. Both compile- and run-time check mode (-b or --both) (Default): This mode will check both of the above cases (both compile- and run-time dependencies).

Check types:
a. EXTERNALDEP - External Dependencies
b. GENERALDEP - General Dependencies (required both at compile and run time)
c. COMPILEDEP - Compile time Dependencies
d. [All are run-time checks]
PYEXT SCANCONF QUEUES PERMISSION

Status Types:
    OK
    MISSING - Missing Dependency or Permission or Plug-in
    INCOMPAT - Incompatible dependency-version or Plugin-version

warning: debian-8.6 version is not supported. Using debian-7.5 versions dependencies to verify and install...

---------------
| SYSTEM INFO |
---------------

 Kernel: 3.16.0-4-686-pae #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) GNU/Linux
 Host: blackbox
 Proc: 3.16.0-4-686-pae #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) GNU/Linux
 Distribution: debian 8.6
 Bitness: 32 bit

-----------------------
| HPLIP CONFIGURATION |
-----------------------

HPLIP-Version: HPLIP 3.14.6
HPLIP-Home: /usr/share/hplip
warning: HPLIP-Installation: Auto installation is not supported for debian distro 8.6 version

Current contents of '/etc/hp/hplip.conf' file:
# hplip.conf. Generated from hplip.conf.in by configure.

[hplip]
version=3.14.6

[dirs]
home=/usr/share/hplip
run=/var/run
ppd=/usr/share/ppd/hplip/HP
ppdbase=/usr/share/ppd/hplip
doc=/usr/share/doc/hplip-doc/HTML
html=/usr/share/doc/hplip-3.14.6
icon=no
cupsbackend=/usr/lib/cups/backend
cupsfilter=/usr/lib/cups/filter
drv=/usr/share/cups/drv
bin=/usr/bin

# Following values are determined at configure time and cannot be changed.
[configure]
network-build=yes
libusb01-build=no
pp-build=yes
gui-build=yes
scanner-build=yes
fax-build=yes
dbus-build=yes
cups11-build=no
doc-build=yes
shadow-build=no
hpijs-install=yes
foomatic-drv-install=yes
foomatic-ppd-install=yes
foomatic-rip-hplip-install=no
hpcups-install=yes
cups-drv-install=yes
cups-ppd-install=no
internal-tag=3.14.6
restricted-build=no
ui-toolkit=qt4
qt3=no
qt4=yes
policy-kit=yes
lite-build=no
udev_sysfs_rules=no
hpcups-only-build=no
hpijs-only-build=no

Current contents of '/var/lib/hp/hplip.state' file:
Plugins are not installed. Could not access file: Datei oder Verzeichnis nicht gefunden

Current contents of '~/.hplip/hplip.conf' file:
[last_used]
device_uri = hp:/par/HP_LaserJet_6P?device=/dev/parport0

[commands]
fax = hp-sendfax -d %FAX_URI%
scan = kooka
prnt = hp-print -p%PRINTER%
pcard = hp-unload -d %DEVICE_URI%
cpy = hp-makecopies -d %DEVICE_URI%

[installation]
version = 3.14.6
date_time = 26.11.2016 10:09:44

[refresh]
rate = 30
enable = False
type = 0

[upgrade]
latest_available_version = 3.13.11

 <Package-name> <Package-Desc> <Required/Optional> <Min-Version> <Installed-Version> <Status> <Comment>

--------------------------
| External Dependencies |
--------------------------

 policykit Admin-Policy-framework OPTIONAL - 0.105 OK -
 gs Ghostscript REQUIRED 7.05 9.06 OK -
 network Network-wget OPTIONAL - 1.16 OK -
 scanimage Shell-Scanning OPTIONAL 1.0 1.0.24 OK -
 error: avahi-utils avahi-utils OPTIONAL - - MISSING 'avahi-utils needs to be installed'
 dbus DBus REQUIRED - 1.8.20 OK -
 cups CUPS REQUIRED 1.1 1.7.5 OK 'CUPS Scheduler is running'
 xsane SANE-GUI OPTIONAL 0.9 0.998 OK -

-------------------------
| General Dependencies |
-------------------------

 error: reportlab Python-PDF-Lib OPTIONAL 2.0 3.1.8 MISSING 'reportlab needs to be installed'
 libcrypto OpenSSL-Crypto-Lib REQUIRED - 1.0.1 OK -
 pil Python-Image-Lib OPTIONAL - 1.1.7 OK -
 pyqt4-dbus PyQt4-DBUS REQUIRED 4.0 4.11.2 OK -
 libjpeg JPEG-Lib REQUIRED - - OK -
 libpthread POSIX-Threads-Lib REQUIRED - 2.19 OK -
 python-dbus Python-DBUS REQUIRED 0.80.0 1.2.0 OK -
 python-devel Python-SDK REQUIRED 2.2 2.7.9 OK -
 pyqt4 Python-Qt4 REQUIRED 4.0 4.11.2 OK -
 cups-devel CUPS-SDK REQUIRED - 1.7.5 OK -
 error: sane-devel SANE-SDK REQUIRED - - MISSING 'sane-devel needs to be installed'
 libusb USB-Lib REQUIRED - 1.0 OK -
 sane Scan-Lib REQUIRED - - OK -
 error: cups-image CUPS-Image-Lib REQUIRED - 1.7.5 MISSING 'cups-image needs to be installed'
 error: libnetsnmp-devel SNMP-Networking-SDK REQUIRED 5.0.9 - MISSING 'libnetsnmp-devel needs to be installed'
 python-xml Python-XML-Lib REQUIRED - 2.1.0 OK -
 python-notify Desktop-notifications OPTIONAL - - OK -

------------------------------
| Compile Time Dependencies |
------------------------------

 gcc gcc-Compiler REQUIRED - 4.9.2 OK -
 error: libtool Build-tools REQUIRED - - MISSING 'libtool needs to be installed'
 make GNU-Build-tools REQUIRED 3.0 4.0 OK -

----------------------
| Python Extentions |
----------------------

 cupsext CUPS-Extension REQUIRED - 3.14.6 OK -
 pcardext PhotoCard-Extension REQUIRED - 3.14.6 OK -
 hpmudext IO-Extension REQUIRED - 3.14.6 OK -

-----------------------
| Scan Configuration |
-----------------------

 hpaio HPLIP-SANE-Backend REQUIRED - 3.14.6 OK 'hpaio found in /etc/sane.d/dll.conf'
 scanext Scan-SANE-Extension REQUIRED - 3.14.6 OK -

------------------------------
| DISCOVERED SCANNER DEVICES |
------------------------------

No Scanner found.

--------------------------
| DISCOVERED USB DEVICES |
--------------------------

  Device URI Model
  ------------------------------------------------ -------------------------------
  hp:/usb/HP_LaserJet_CP1525nw?serial=00CNC3212487 HP LaserJet CP1525nw

---------------------------------
| INSTALLED CUPS PRINTER QUEUES |
---------------------------------

HP-LaserJet-CP1525nw
--------------------
Type: Printer
Device URI: hp:/usb/HP_LaserJet_CP1525nw?serial=00CNC3212487
PPD: /etc/cups/ppd/HP-LaserJet-CP1525nw.ppd
warning: Failed to read /etc/cups/ppd/HP-LaserJet-CP1525nw.ppd ppd file
PPD Description:
Printer status: printer HP-LaserJet-CP1525nw is idle. enabled since Sa 26 Nov 2016 10:00:53 CET
Communication status: Good

HP_LaserJet_CP1525nw
--------------------
Type: Unknown
Device URI: tea4cups:/socket://192.168.178.189
PPD: /etc/cups/ppd/HP_LaserJet_CP1525nw.ppd
PPD Description: HP Color LaserJet cp1518ni pcl3, hpcups 3.14.6
Printer status: printer HP_LaserJet_CP1525nw is idle. enabled since Do 24 Nov 2016 23:05:45 CET
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.

hplj6p
------
Type: Unknown
Device URI: parallel:/dev/lp0
PPD: /etc/cups/ppd/hplj6p.ppd
PPD Description: HP LaserJet 6P Foomatic/hpijs, hpijs 2.8.4.2 - HPLIP 2.8.4
Printer status: printer hplj6p is idle. enabled since So 23 Dez 2012 19:03:49 CET
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.

hplj6pcolor
-----------
Type: Unknown
Device URI: parallel:/dev/lp0
PPD: /etc/cups/ppd/hplj6pcolor.ppd
PPD Description: HP LaserJet 6P - CUPS+Gutenprint v5.2.10
Printer status: printer hplj6pcolor is idle. enabled since Fr 08 Jul 2016 07:16:45 CEST
warning: Printer is not HPLIP installed. Printers must use the hp: or hpfax: CUPS backend for HP-Devices.

--------------
| PERMISSION |
--------------

USB HP-LaserJet-CP1525nw Required - - OK Node:'/dev/bus/usb/007/009' Perm:' root lp rw- rw- rw- rw- rw- r--'

-----------
| SELINUX |
-----------

SELinux disabled Optional - - OK -

-----------
| SUMMARY |
-----------

Missing Required Dependencies
-----------------------------
error: 'libsane-dev' package is missing/incompatible
error: 'libcupsimage2' package is missing/incompatible
error: 'libcupsimage2-dev' package is missing/incompatible
error: 'libsnmp-dev' package is missing/incompatible
error: 'libtool' package is missing/incompatible

Missing Optional Dependencies
-----------------------------
error: 'avahi-utils' package is missing/incompatible
error: 'python-reportlab' package is missing/incompatible

Total Errors: 6
Total Warnings: 3

Run 'hp-doctor' command to prompt and fix the issues.

Done.
rd@blackbox:~/Ablage/Software/ETS5/Full$