Nexus 7 – install old android version 4

Our Nexus 7 (first version) was super slow since it was updated to android version 5.x so I decided to install version 4.4.4 which is the latest version before version 5. I tried to downgrade by the instructions supported by Google but it did not work and I have to call some additional commands. See solution section. Hopefully the tablet is a little bit faster with version 4.4.4. Before I started I have to enable USB-Debuging in the Developertools on my device. Link to the Google factory images: Problem I called the following command as recommended in the instructions: ./ Result (quite […]

Syncing images from android smartphone to raspberry pi

I was looking for a solution to backup the photos taken with my smartphone to our raspberry pi. Android side I searched for synchronization apps and ended up using rsync as backup tool. Therefore I installed the app ‘Rsync Wrapper‘ on my smartphone and configured it with the following parameters: Source: /storage/9C33-6BBD/DCIM/Camera/ Destination: martin@ Option: -r –ignore-existing –progress -e “ssh -l martin -i /data/user/0/net.letscorp.rsyncwrapper/files/06a73f67-6234-40e7-81de-7add8fa4c783.key -y” I removed the –verbose parameter and added the –ignore-existing parameter. The –ignore-existing parameter was added by me because the synchronization took up to twenty minutes where the most of the time was used to check which files are […]

Set up Zotero with own WebDAV space

Today I set up Zotero on my Debian (Strech) GNU/Linux PC at home. I installed the following debian packages with aptitude: aptitude install xul-ext-zotero libreoffice-zotero-integration Problem Firefox started with the new Zotero plug-in but when I tried to configure WebDAV for file syncing I received an error message which told me that my user name or password are invalid. This error message occurred when I tried to hit the ‘verify’ button. Approach My suspicion was that firefox is missing some WebDAV functionality so I compared the intstalled packages of a other Debian machine where it worked. I searched for packages which contain the […]