root@dm520:~# cd /tmp
root@dm520:/tmp# wget http://www.dreamboxupdate.com/opendreambox/2.5/experimental/images/dm520/vmlinux.gz-rescue-3.4-r1-dm520-20200227.bin
Connecting to www.dreamboxupdate.com (178.63.252.154:80)
vmlinux.gz-rescue-3. 100% |***********************************************************************| 11235k  0:00:00 ETA
root@dm520:/tmp# ls
vmlinux.gz-rescue-3.4-r1-dm520-20200227.bin
root@dm520:/tmp# flash-rescue vmlinux.gz-rescue-3.4-r1-dm520-20200227.bin
Manufacturer ID: c2
Memory type    : 20
Memory density : 18
read id ok
comparing 2809 sectors...
erasing 2808 sectors...
writing 44928 pages...
verifying 2808 sectors...
flash done
root@dm520:/tmp#

[*] Downloading 'http://dreamboxupdate.com/download/recovery/dm520/release/recovery.sig'
[*] Downloading 'http://dreamboxupdate.com/download/recovery/dm520/release/recovery'
[*] Verifying signature of 'recovery'
gpgv: Signature made Wed Dec 21 02:01:50 2016 UTC using RSA key ID A07683D3
gpgv: Good signature from "Dreambox DM520 Recovery <dm520@recovery.dreambox.de>"
[*] Verifying signature of '/data/.recovery/recovery'
[*] Running './recovery'
[*] Options '-v'
[*] Downloading 'http://dreamboxupdate.com/download/recovery/dm520/release/dreambox-image-dm520.tar.xz.sig'
[*] Downloading 'http://dreamboxupdate.com/download/recovery/dm520/release/dreambox-image-dm520.tar.xz'
[*] Verifying signature of 'dreambox-image-dm520.tar.xz'
gpgv: Signature made Thu Nov 14 16:41:51 2019 UTC using RSA key ID A07683D3
gpgv: Good signature from "Dreambox DM520 Recovery <dm520@recovery.dreambox.de>"
[*] Removing volume 0 from /dev/ubi0
[*] Creating volume 0 on /dev/ubi0 (dreambox-rootfs)
Set volume size to 503332864
Volume ID 0, size 3964 LEBs (503332864 bytes, 480.0 MiB), LEB size 126976 bytes (124.0 KiB), dynamic, name "dreambox-rootfs", alignment 1
[*] Creating ubifs filesystem on /dev/ubi0_0
[*] Mounting '/dev/ubi0_0' to '/mnt'
[*] Extracting 'dreambox-image-dm520.tar.xz' to '/mnt'
[*] Mounting '/dev' to '/mnt/dev'
[*] Mounting '/proc' to '/mnt/proc'
[*] Mounting '/run' to '/mnt/run'
[*] Mounting '/sys' to '/mnt/sys'
[*] Mounting '/tmp' to '/mnt/tmp'
Manufacturer ID: c2
Memory type    : 20
Memory density : 18
read id ok
comparing 98 sectors...
nothing to do
update-alternatives: error: cannot append to '/var/log/alternatives.log': No such file or directory
[*] Erasing flash memory on /dev/mtd2
[*] Writing to NAND memory on /dev/mtd2
[*] Unmounting '/mnt/dev'
[*] Unmounting '/mnt/proc'
[*] Unmounting '/mnt/run'
[*] Unmounting '/mnt/sys'
[*] Unmounting '/mnt/tmp'
[*] Unmounting '/mnt'
[*] Finished successfully. You may reboot now.
[*] Initiating reboot