WD My Cloud EX2 Ultra not booting after upgrade to Debian Trixie (3 replies)

Hi all, I have upgrade my WD My Cloud EX2 Ultra to Debian Trixie. The upgrade went fine. I rebooted the box and then the blue LED kept blinking, the box did not boot. I connected the serial-USB dongle and found there is a problem with init, that causes a kernel panic. My first thought was to check that /bin/systemd existed. It did not so I made a symlink from /bin/systemd to /usr/lib/systemd/systemd. This did not help, I got the same kernel panic message.
Anyone a suggestion what to do?

[    3.264117][    T1] Waiting 10 sec before mounting root device...
[   13.307556][    T1] md: Skipping autodetection of RAID arrays. (raid=autodetect will force)
[   13.316572][    T1] EXT4-fs (sda1): mounting ext3 file system using the ext4 subsystem
[   13.334677][    T1] EXT4-fs (sda1): mounted filesystem 5c96dcf2-3df7-4757-95a5-37b8e661876a ro with ordered data mode. Quota mode: none.
[   13.347103][    T1] VFS: Mounted root (ext3 filesystem) readonly on device 8:1.
[   13.358726][    T1] devtmpfs: mounted
[   13.364355][    T1] Freeing unused kernel image (initmem) memory: 1024K
[   13.371632][    T1] Checked W+X mappings: passed, no W+X pages found
[   13.378090][    T1] Run /bin/systemd as init process
[   13.389039][    T1] Kernel panic - not syncing: Requested init /bin/systemd failed (error -2).
[   13.397709][    T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 6.5.7-mvebu-tld-1 #1
[   13.405325][    T1] Hardware name: Marvell Armada 380/385 (Device Tree)
[   13.411978][    T1]  unwind_backtrace from show_stack+0x10/0x14
[   13.417949][    T1]  show_stack from dump_stack_lvl+0x40/0x4c
[   13.423735][    T1]  dump_stack_lvl from panic+0x104/0x308
[   13.429258][    T1]  panic from kernel_init+0xa0/0x130
[   13.434430][    T1]  kernel_init from ret_from_fork+0x14/0x28
[   13.440214][    T1] Exception stack(0xf0831fb0 to 0xf0831ff8)
[   13.445994][    T1] 1fa0:                                     00000000 00000000 00000000 00000000
[   13.454916][    T1] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[   13.463839][    T1] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
[   13.471193][    C0] CPU0: stopping
[   13.471198][    C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.5.7-mvebu-tld-1 #1
[   13.471206][    C0] Hardware name: Marvell Armada 380/385 (Device Tree)
[   13.471210][    C0]  unwind_backtrace from show_stack+0x10/0x14
[   13.471225][    C0]  show_stack from dump_stack_lvl+0x40/0x4c
[   13.471235][    C0]  dump_stack_lvl from do_handle_IPI+0x84/0x11c
[   13.471245][    C0]  do_handle_IPI from ipi_handler+0x14/0x20
[   13.471256][    C0]  ipi_handler from handle_percpu_devid_irq+0x4c/0xe8
[   13.471271][    C0]  handle_percpu_devid_irq from handle_irq_desc+0x1c/0x2c
[   13.471288][    C0]  handle_irq_desc from gic_handle_irq+0x58/0x64
[   13.471302][    C0]  gic_handle_irq from generic_handle_arch_irq+0x28/0x3c
[   13.471310][    C0]  generic_handle_arch_irq from __irq_svc+0x88/0xc8
[   13.471319][    C0] Exception stack(0xc1001f20 to 0xc1001f68)
[   13.471327][    C0] 1f20: 00000000 c0ddbca8 00001ad4 00000001 00000000 00000000 00000000 c100e140
[   13.471334][    C0] 1f40: c100a010 c100a070 c0f42104 0000011f 00000001 c1001f70 c0a73cb0 c0a73cb4
[   13.471338][    C0] 1f60: 20000113 ffffffff
[   13.471342][    C0]  __irq_svc from default_idle_call+0x28/0x2c
[   13.471351][    C0]  default_idle_call from do_idle+0x108/0x280
[   13.471363][    C0]  do_idle from cpu_startup_entry+0x28/0x2c
[   13.471371][    C0]  cpu_startup_entry from rest_init+0xb8/0xd4
[   13.471381][    C0]  rest_init from arch_post_acpi_subsys_init+0x0/0x8
[   13.603889][    T1] ---[ end Kernel panic - not syncing: Requested init /bin/systemd failed (error -2). ]---