Factory reset of OpenWrt router, are my sensitive config files really not recoverable after command "firstboot"?

I would like to give away an old OpenWrt router. I have done the following.
firstboot -y && reboot
/dev/ubi0_1 is mounted as /overlay, only erasing files
Connection to 192.168.55.12 closed by remote host.

Is this really safe, can … Continue reading Factory reset of OpenWrt router, are my sensitive config files really not recoverable after command "firstboot"?

Only Flatpak and F-Droid apps on Chromebook. I have Privacy concerns about the Linux layer "Crostini". Are these concerns really justified? [closed]

Chromebooks are very aggressively priced (massively cheaper than Apple hardware) and also offer netbook formats. I am toying with the idea of buying a Chromebook and only using Flatpak, Debian and F-Droid apps on Chromebook (Crostini). In … Continue reading Only Flatpak and F-Droid apps on Chromebook. I have Privacy concerns about the Linux layer "Crostini". Are these concerns really justified? [closed]

As a private individual, cleanly destroy a large number of paper documents. Are there alternatives to the consumer shredder?

I need to safely dispose of about 30 federal folders. That means 95% of the documents will be shredded and the rest stored. I bought a small shredder for private people (professional shredders are too expensive) and now I see that the effo… Continue reading As a private individual, cleanly destroy a large number of paper documents. Are there alternatives to the consumer shredder?

Are there IoT devices that send data home despite blocked internet connection (with the detour via bluetooth on the phone)?

I am increasingly buying IoT aka smart devices for my household.
All these devices need to be connected to WLAN and proprietary app (via bluetooth on iPhone). I do this initial step, but then block the internet access for the IoT device in… Continue reading Are there IoT devices that send data home despite blocked internet connection (with the detour via bluetooth on the phone)?