Public bug reported:
System Environment:
- Hardware: Raspberry Pi 3 Model B Rev 1.2
- OS: Ubuntu 26.04 (development branch)
Description:
When updating the kernel or running `flash-kernel` on a Raspberry Pi 3B, it
incorrectly selects the DTB for Raspberry Pi 5 (`bcm2712-rpi-5-b.dtb`) instead
of the correct RPi 3 DTB.
This causes a boot failure on the next reboot, triggering `piboot-try` to fall
back to the known good state with the error: "New boot assets in
/boot/firmware/new failed."
Even when explicitly overriding the machine type with the environment variable,
it still forces the RPi 5 DTB:
`sudo FK_MACHINE="Raspberry Pi 3 Model B Rev 1.2" flash-kernel`
Steps to Reproduce:
1. Boot Ubuntu Server 26.04 on Raspberry Pi 3 Model B.
2. Run `sudo flash-kernel`.
3. Observe the output incorrectly using `bcm2712-rpi-5-b.dtb`.
Terminal Output:
Using DTB: bcm2712-rpi-5-b.dtb
Installing
/lib/firmware/7.0.0-1020-raspi/device-tree/broadcom/bcm2712-rpi-5-b.dtb into
/boot/dtbs/7.0.0-1020-raspi/./bcm2712-rpi-5-b.dtb
flash-kernel: installing version 7.0.0-1020-raspi
find: ‘/etc/flash-kernel/dtbs’: No such file or directory
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: flash-kernel (not installed)
ProcVersionSignature: Ubuntu 7.0.0-1020.20-raspi 7.0.14
Uname: Linux 7.0.0-1020-raspi aarch64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: arm64
CasperMD5CheckResult: unknown
CloudArchitecture: aarch64
CloudID: nocloud
CloudName: unknown
CloudPlatform: nocloud
CloudSubPlatform: config-disk (/dev/mmcblk0p1)
Date: Thu Oct 8 16:55:09 2026
ProcEnviron:
LANG=C.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm
XDG_RUNTIME_DIR=<set>
SourcePackage: flash-kernel
UpgradeStatus: Upgraded to resolute on 2026-09-29 (8 days ago)
** Affects: flash-kernel (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug arm64 resolute
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2169942
Title:
flash-kernel incorrectly installs bcm2712-rpi-5-b.dtb on Raspberry Pi
3 Model B
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/flash-kernel/+bug/2169942/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
