If you're reading this, either your DM920 is running something old and you want to upgrade, or something went wrong and you need to restore. In both cases, flashing OpenATV 7.4 for Dreambox DM920 installation and setup is exactly what needs to be done right the first time. Below are specific steps with no filler, with real file paths and commands.

What's new in OpenATV 7.4 and why upgrade

OpenATV 7.4 is not a cosmetic update. The Linux kernel has been updated to version 4.14.x (a Dreambox-specific branch is used for DM920), and the Python runtime has been fully migrated to Python 3.11. This has direct consequences: plugins written for Python 2 or Python 3.6 from older OpenATV 6.x versions will not work. You'll need to find updated versions or build them yourself.

The DVB stack has been updated and includes current drivers for DM920 tuner modules. Version 7.x adds native DVB-S2X support — but only if your receiver's configuration includes a compatible tuner module. You can verify this with the command

cat /proc/bus/nim_sockets after flashing.Key changes compared to OpenATV 6.x and 7.3

Compared to 6.x — Python ABI change, updated OpenWebif, improved plugin manager with support for new repositories. Compared to 7.3 — DVB stack security patches, fixes for several critical bugs in Softcam Manager, improved CrossEPG operation with new sources.

The Enigma2 GUI is visually almost unchanged. Those working with skins like MetrixHD will barely notice anything different on screen.

OpenATV 7.4 compatibility with Dreambox DM920

DM920 is officially supported in OpenATV 7.4. The image for this receiver is published in the official OpenATV repository on GitHub (the project's releases page). The specific tuner module model affects capabilities but not firmware compatibility itself.

When an update is not needed: risks and contraindications

Here's the honest answer: if you have OpenATV 7.3, OScam is working, channels are opening, nothing is crashing — don't touch it. Upgrading only makes sense for specific problems (tuner bug, plugin incompatibility) or when migrating from DreamOS/6.x.

Flashing via USB Stick Installer is a full reset. All configs will be lost. You will lose: tuner settings, channel list, OScam configs, timer settings. A backup is mandatory, and it needs to be done correctly — more on that below.

Preparing for flashing: image, USB and backup

Don't rush here. Most problems after flashing are due to lost configs that could have been saved in 10 minutes.

Where to get the official OpenATV 7.4 image for DM920

Official OpenATV repository only. The filename looks something like this:

dreambox-image-dm920-20250115-openatv-7.4.zip (the date in the filename changes with each build). Inside the archive is a file with the extension.nfi, which is exactly what's needed for flashing.No mirrors, no forum distributions. Verify the file hash using the MD5/SHA256 published alongside the release.

USB drive requirements: file system and capacity

Format strictly as FAT32. For Windows: right-click → Format → FAT32. For Linux:

mkfs.vfat -F 32 /dev/sdX.Drives larger than 32 GB are a problem. Standard Windows does not allow formatting FAT32 partitions larger than 32 GB. Use the Rufus utility (Windows) or mkfs.vfat on Linux. The DM920 bootloader may not recognize a drive formatted as exFAT or NTFS — don't experiment.

From experience: SanDisk Ultra and Kingston DataTraveler work without issues. With some no-name drives the DM920 freezes at the "Reading USB" stage — simply swap the drive.

Backing up settings via Enigma2 Backup

Menu → Setup → System → Backup/Restore → Backup Settings. This saves Enigma2 settings, the channel list (

/etc/enigma2/lamedb), and bouquet files. The backup file will be written to USB or to/media/hdd/.But here's the critical point most guides skip: the standard Enigma2 Backup does NOT include softcam configs. The folders

/etc/oscam/ and the file/etc/CCcam.cfg are not included. These must be copied manually.Manually backing up OScam/CCcam configs

Connect via SSH (port 22, login root) and run:

tar -czf /media/usb/backup_oscam.tar.gz /etc/oscam/

Also save the channel list manually if you want to be sure:

tar -czf /media/usb/backup_enigma2.tar.gz /etc/enigma2/

After flashing, restoration is done in reverse order. OScam file permissions need to be checked after unpacking — more on that in the OScam section.

Step-by-step installation of OpenATV 7.4 via USB Stick Installer

USB Stick Installer and Multiboot are different mechanisms. USB Stick Installer performs a full reflash replacing all partitions. Multiboot allows keeping multiple firmware versions simultaneously and switching between them. Don't confuse them — a mistake here means either data loss or a brick.

Writing the image to USB: instructions for Windows and Linux

Extract the downloaded .zip archive. Copy the

.nfi file to the root of the USB drive (not into a folder, directly to the root). Nothing else needs to be done — no special image-writing utilities required.Windows: regular copy via File Explorer. Linux:

cp dreambox-image-dm920-*.nfi /mnt/usb/. Make sure the file copied completely (ls -lh /mnt/usb/ should show the correct size).Booting DM920 into USB Stick Installer mode

Insert the USB into the rear panel of the DM920 (not via a hub). Fully power off the receiver. Press and hold the power button on the front panel, then switch on power via the mains switch on the rear panel. Hold the button for about 5–7 seconds until a message appears on the display or screen.

If the receiver simply boots in normal mode — the USB was not recognized. Check: FAT32 file system, file is in the root, USB inserted before powering on.

The flashing process: what appears on screen and how long to wait

The DM920 display will show flashing progress. Nothing will appear on the TV screen — only status on the receiver's built-in display. The process takes 5 to 10 minutes. After completion the receiver will reboot automatically.

Do not disconnect power during flashing. Do not remove the USB. If flashing has been stuck for more than 15 minutes — the problem is most likely with the drive.

First boot: Enigma2 setup wizard

After reboot the Setup Wizard will launch. Language, country, time zone selection. Then it will offer to configure tuners. You can skip and configure later via the menu. I recommend skipping at this stage and restoring configs first — less confusion that way.

Configuring DVB-S2 and DVB-T2 tuners on DM920

Menu → Setup → Service Searching → Tuner Configuration. DM920 supports up to four tuner modules depending on configuration. The standard configuration is two DVB-S2 tuners (tuner A and tuner B).

Tuner configuration via Setup → Tuner Configuration menu

Tuner A is usually assigned as the primary DVB-S2. Tuner B can be configured as DVB-S2 (second satellite) or DVB-T2/C, if the tuner module supports it. Important: not all DM920 configurations are the same. Check the physical labeling on the tuner module or run

cat /proc/bus/nim_sockets for exact identification.Configuring DiSEqC 1.0 / 1.1 / 1.2 for multi-feed setups

DiSEqC 1.0 — up to 4 satellites, Committed switch. DiSEqC 1.1 — up to 16 satellites, Uncommitted switch. The difference matters when using a multiswitch: Committed commands go to the primary switch, Uncommitted to the cascaded switch.

DiSEqC 1.2 — motorized dish. After flashing all motor positions are reset. Each position will need to be manually recalibrated via Setup → Positioner.

Standard parameters for Astra 19.2E: LOF Low 9750, LOF High 11800, LOF Threshold 11700, voltage 13V (vertical polarization) or 18V (horizontal).

Satellite scanning: auto-search vs manual transponder entry

Auto-search is convenient but slow and sometimes misses transponders. For specific transponders it's better to enter manually: frequency, symbol rate, polarization, FEC. For example 11053 H 22000 3/4 on Astra 19.2E.

Common errors when scanning channels on DM920

"No signal" or "Tuner locked: No" — first check LNB voltage. If a DiSEqC command isn't switching — try changing the Committed/Uncommitted order. Sometimes the problem is simply the cable: check the F-connector fittings.

After updating from 6.x to 7.x some users report DiSEqC settings being reset even after restoring an enigma2 backup — it's best to manually re-check tuner configuration.

Installing and configuring OScam after flashing OpenATV 7.4

This is the most important section for those using cardsharing. Flashing OpenATV 7.4 for Dreambox DM920 installation and setup of OScam is a process that requires precision: one wrong parameter in the config, and the ECM won't go through.

Installing OScam via the Enigma2 plugin manager

Menu → Extensions → Manage Extensions → Softcams. Find OScam in the list (usually several versions — choose the current one for Python 3). After installation the binary is located at

/usr/bin/oscam, configs in/etc/oscam/.Alternative — installation via ipk package over SSH:

opkg install oscam (if the repository is configured).Restoring configs from backup

Copy the backup archive to USB and extract:

tar -xzf /media/usb/backup_oscam.tar.gz -C /

After extraction, be sure to check file permissions:

chmod 644 /etc/oscam/*

If you used SoftCam keys and the

/var/keys/ folder — it needs to be recreated and the key files placed there again. This folder is not saved in the standard backup.Structure of OScam configuration files: oscam.conf, oscam.server, oscam.user

Basic

/etc/oscam/oscam.conf:[global]

The file

/etc/oscam/oscam.server describes connections to servers. Example reader section for the CCcam protocol:[reader]

For newcamd:

protocol = newcamd, add the parameterkey = 0102030405060708091011121314. For camd35:protocol = camd35, port is usually 5100 or 35000.The file

/etc/oscam/oscam.user describes local clients (if DM920 is sharing cards to other devices). For typical client-only use this file is minimal or not needed at all.Verifying OScam operation via the web interface (port 8888)

Open a browser:

http://[receiver-IP-address]:8888. Username and password from oscam.conf. On the Readers tab the reader should be visible with status connected. On the Live Log tab watch for ECM and DCW lines.If the web interface is unavailable — don't panic immediately. Check iptables:

iptables -L -n | grep 8888

If the port is blocked, add a rule:

iptables -I INPUT -p tcp --dport 8888 -j ACCEPT

Common errors after a firmware update and how to fix them

"ECM not found" in the OScam log — this is not a connection problem, it's a CAID or permissions problem. Diagnose in order: check lines in oscam.server (correct protocol, host, port), check CAID in oscam.user, confirm that OScam is selected as the active softcam in Enigma2 (Menu → Extensions → Softcam Manager → select OScam → Start).

Conflict with a CI module: if a physical conditional access module is installed in the DM920's CAM slot, OScam sometimes incorrectly intercepts ECM. Solution — set

dvbapi_priority = s in oscam.conf, or temporarily remove the physical CAM for diagnostics.Restarting OScam without rebooting the receiver:

/etc/init.d/oscam restartAdditional plugins and system optimization

Installing CrossEPG for EPG and schedule updates

CrossEPG is installed via Manage Extensions. After installation configure

providers.xml: select providers for Astra 19.2E, Hotbird 13E or other satellites in your configuration. EPG update scheduling is configured in the CrossEPG Setup menu; recommended time: 4:00 AM when transponder traffic is minimal.OpenWebif: remote receiver management via browser

OpenWebif is installed from the plugin repository. Default port is 80 (HTTP) or 443 with SSL. Via OpenWebif you can manage channels, timers, download configs — convenient for remote administration without SSH.

To change the port: Menu → Setup → System → OpenWebif Configuration.

OScam autostart on system boot

If OScam was installed via Softcam Manager — autostart is configured there: select OScam → Autostart → Yes. Verify the symlink exists:

ls -la /etc/rcS.d/ | grep oscam. There should be a link of the formS95oscam -> /etc/init.d/oscam.If the symlink is missing after installation:

update-rc.d oscam defaults 95 5Configuring automatic OpenATV updates without losing configs

OTA updates within OpenATV: Menu → Setup → System → Softwaremanager → Check for Updates. This is an online firmware update that preserves the contents of

/etc/enigma2/ — the channel list and main settings.But

/etc/oscam/ may be affected during an OTA update if the update includes replacing the OScam package. The rule is simple: before any update — manual backup. The command is the same:tar -czf /media/usb/backup_oscam_$(date +%Y%m%d).tar.gz /etc/oscam/Flashing OpenATV 7.4 for Dreambox DM920 installation and setup via OTA works correctly when upgrading 7.3 → 7.4. When upgrading from 6.x — USB Stick Installer only; OTA is not supported between major versions.

Can OpenATV 7.4 be installed over DreamOS without losing channels?