# Raspberry Pi OS 64 Bit conversion **URL:** \ **Category:** Debian family\ **Created:** [May 2, 2022, 9:23pm UTC](https://hub.mender.io/t/raspberry-pi-os-64-bit-conversion/4919 "2022-05-02T21:23:30Z")\ **Posts on this page:** 1\ **Showing post:** 23
**Author:** ![Pedro-Jesus-Fuentes](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/pedro-jesus-fuentes/32/1898_2.png) [@Pedro-Jesus-Fuentes](https://hub.mender.io/u/Pedro-Jesus-Fuentes)\ **Post date:** [June 26, 2025, 1:36pm UTC](https://hub.mender.io/t/raspberry-pi-os-64-bit-conversion/4919/23 "2025-06-26T13:36:55Z")
Hi Josef, I have several Raspberry Pi 4 devices currently running arm32 Debian Bookworm images in standalone mode. In the past, we had to use arm32 because `mender-convert` didn’t support arm64. Now that arm64 is supported, I need to upgrade these devices from arm32 to arm64 using a golden image. I created the artifact from a golden arm64 device and installed it successfully. I also remapped the `/uboot` mount point to `/boot/firmware` to match the new layout, and the update process itself went smoothly. However, I’m running into issues with the U-Boot environment variables. The arm32 and arm64 configurations use different variables, and simply switching the root filesystem isn’t enough. To address this, I used `dd` to extract the U-Boot environment sectors from the arm64 device—specifically from offsets `0x400000` (size `0x4000`) and `0x800000` (size `0x4000`)—and wrote them to the same locations on the target devices. With this, the device boots successfully into the arm64 system and the new partition. The issue is that these U-Boot variables include some device-specific values, such as the MAC address. When I overwrite these sectors, I also overwrite those identifiers, which is problematic. Is there a way to trigger a regeneration of the U-Boot environment variables in a similar way to how they are initially created when the system boots for the first time from a fresh image? That way, I could avoid overwriting device-specific data like the MAC address, while still applying the correct layout and boot configuration for arm64. Thanks in advance! --- _[View the full topic](https://hub.mender.io/t/raspberry-pi-os-64-bit-conversion/4919)._