# Failed installation - Failed to fetchhttps://zk-sw-repo.s3.amazonaws.com/apt-repo-bookworm-aarch64/dists/bookworm/InRelease **URL:** \ **Category:** ZYMKEY4\ **Created:** [December 3, 2023, 5:24pm UTC](https://community.zymbit.com/t/failed-installation-failed-to-fetchhttps-zk-sw-repo-s3-amazonaws-com-apt-repo-bookworm-aarch64-dists-bookworm-inrelease/1609 "2023-12-03T17:24:18Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Jan](https://avatars.discourse-cdn.com/v4/letter/j/ce7236/32.png) [@Jan](https://community.zymbit.com/u/Jan)\ **Post date:** [December 3, 2023, 5:24pm UTC](https://community.zymbit.com/t/failed-installation-failed-to-fetchhttps-zk-sw-repo-s3-amazonaws-com-apt-repo-bookworm-aarch64-dists-bookworm-inrelease/1609/1 "2023-12-03T17:24:18Z")
Hi, I’ve tried installing the libraries on my Zymkey 4i many times, but none of the attempts were successful. I have a product built on the Raspberry Pi 4B, and the last thing was to secure the data. After I got the Zymkey, I followed every single step from the [https://docs.zymbit.com/getting-started/zymkey4/quickstart/](https://docs.zymbit.com/getting-started/zymkey4/quickstart/) tutorial, and everything seemed to look normal on my 64-bit Raspberry Pi OS Bullseye (Raspbian OS GNU/Linux 11) with Python 3.9.2 as the default Python version, but when I tried importing the zymkey library, I got an ImportError: No module named zymkey. I searched the internet for a solution and found: [ImportError: No module named zymkey](https://community.zymbit.com/t/importerror-no-module-named-zymkey/554) but with no result because running the installing command twice had no effect, and @alohaJoe solved the problem by installing a clean installation of 64-bit Bullseye. But when I tried a clean installation of 64-bit Bullseye, 32-bit Bullseye, or 64-bit Bookworm with the default Python version of 3.11.2 or 3.9.2, the best I could get was: ```auto E: Failed to fetch https://zk-sw-repo.s3.amazonaws.com/apt-repo-bookworm-aarch64/dists/bookworm/InRelease 403 Forbidden [IP: ...] E: The repository 'https://zk-sw-repo.s3.amazonaws.com/apt-repo-bookworm-aarch64 bookworm InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. Installing Zymkey Packages... ``` This error showed up on my Bullseye and Bookworm versions. Any ideas? ---
**Author:** ![Bob\_of\_Zymbit](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Bob\_of\_Zymbit](https://community.zymbit.com/u/Bob_of_Zymbit)\ **Post date:** [December 3, 2023, 7:04pm UTC](https://community.zymbit.com/t/failed-installation-failed-to-fetchhttps-zk-sw-repo-s3-amazonaws-com-apt-repo-bookworm-aarch64-dists-bookworm-inrelease/1609/2 "2023-12-03T19:04:29Z")
@Jan We have not added support for bookworm yet. Your error messages indicate you are trying to fetch from a Zymbit bookworm 64-bit repo that does not exist. This would be coming from /etc/apt/sources.list.d/zymbit.list somehow referencing bookworm-aarch64, maybe from a previous attempt? We support bullseye 64-bit and 32-bit. Please note in the _Quickstart_, for 32-bit _As of March 2023, Raspberry PI OS 32-bit images install the 64-bit kernel along with the 32-bit root filesystem. This does not allow our installation script to work. In order to properly install on an 32-bit system, edit `/boot/config.txt` and add the following line to the bottom of the file, then reboot._ _`arm_64bit=0`_ ---
**Author:** ![crapitouille](https://avatars.discourse-cdn.com/v4/letter/c/bbce88/32.png) [@crapitouille](https://community.zymbit.com/u/crapitouille)\ **Post date:** [January 15, 2024, 8:42pm UTC](https://community.zymbit.com/t/failed-installation-failed-to-fetchhttps-zk-sw-repo-s3-amazonaws-com-apt-repo-bookworm-aarch64-dists-bookworm-inrelease/1609/3 "2024-01-15T20:42:36Z")
any outlook on the supportability of Bookworm ? thanks ---
**Author:** ![Bob\_of\_Zymbit](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Bob\_of\_Zymbit](https://community.zymbit.com/u/Bob_of_Zymbit)\ **Post date:** [January 15, 2024, 10:26pm UTC](https://community.zymbit.com/t/failed-installation-failed-to-fetchhttps-zk-sw-repo-s3-amazonaws-com-apt-repo-bookworm-aarch64-dists-bookworm-inrelease/1609/4 "2024-01-15T22:26:00Z")
Yes, bookworm (64-bit) support has been added. See chart of supported OS’ here: [https://docs.zymbit.com/](https://docs.zymbit.com/)