OpenATV 7.3 back for DM800SE only working with Original Box

the openATV image is meant for USB boot, here is a simple guide for installation

Prepare:

you need a USB Key or USB HDD min 1 GB, i have test a cheap old Laptop SATA HDD
usb cable connect to USB Console Port for Update Bios Settings

Install a old openATV 5.1 Image: http://images.mynonpublic.com/openatv/5.1/dm800se/openatv-5.1-dm800se-20160326.zip

the install script was only tested with this image!

Flash the openATV 5.1 Image with your webbrower



The script starts
Now connect the USB stick and select the device
Important all data will be lost

The USB stick is now formatted and the openATV 7.3 image is loaded and installed.

After the installation is complete, restart the box, remove the USB stick and change the bios to USB boot.

Enable USB support
change with page up/down to USB and add /autoexec_dm800se.bat

save config and restart

now power off the Box connect the USB Key and start
Box now Booting with openATV 7.3

to boot from flash again change bios setting to flash and delete the entry

Excellent Job captain !

Ref : https://www.opena.tv/dreambox-800se/63433-openatv-7-3-usb-image-howto-original-box.html#post539082