you won't get this to dual boot. I would say mission impossible!

recalbox is basically an embedded system and an emulator. if you look at the way config.txt boots the OS you will see there is no extra way of handing off the firmware to booting the kernel when kms takes over. You would have to take over and boot a NON embedded kernel at firmware handoff time.

maybe you got a CM4 with e-MMC memory?

If you try to write it to SD card and boot from there it won't work. CM4 are specifically designed to use e-MMC OR SD card on the lite version only.
These are well known issues.

hi,
Just to let people know I have a flashed case 2 to get rid of the dreaded 20 min time-out/suspend built into the original models.
It means uninterrupted music on Kodi - without losing access to the pad/screen on suspend - (often involves a hard reset.)

I also tested the onboard USB device for FR and IMD.
It's much better than the "headphones" device shown to be horrible from the BCM chip when reviewed on ASR.

I also have spare docks for those that didn't get one with their Case 2 (the cheaper "non deluxe" variant).

I have repaired a number of these, inc those with the dreaded defective pixels or a blown Li-ion battery.

Any stuff needed EU only.

on CM4 e-mmc
latest recalbox 9.2+ on retroflag case2

I tested this on both the older 9.1 and now the newer 9.2 with updates.
This retroflag case 2 is being used mostly as a media player.

If you add extra wifi networks to connect to, which are not entered by the gaming console with SSID and password (it allows an extra 2 in the .conf file, which you can edit) the extra ones STILL don't connect.
PLS can you explain why?

FYI.
In Kodi it is now possible to get youtube working via wifi.
The output at 720p can be really good with HDMI sound and good quality video on a big HDMI screen via the DOCK.
nabvi

I don't know why google made this so difficult but here it is.
It has to use youtubeTV as a possibility.
Nav is all ok via the 8081 port interface or direct on the TV with a keyboard/mouse.

Not all youtube videos work but that may be down to Kodi.

If you add the following possibility "YouTube on TV has some access to your Google Account". - You have to log in 2x and approve access of the device to the google account.

This entails adding profiles and secret passwords to the google account.
The hassle is worthwhile, because samba makes it possible to upload videos to playback on this retroflag case 2.

The Li-ion onboard battery makes using a CM4 on any other support a nonsense.
This is basically the only raspberry pi device you can use in a car - especially if you have an AUX jack input on the car radio, and a wifi access point in car.
The battery can be kept topped up simply from a cigarette lighter adaptor.

@davidb2111
le CM4 marchent bcp mieux avec e-MMC.

Je dois trouver ou sont les Firmware de recalbox parce que j'utilise que KODI.
Besoin d'info EDID info pour le TFT - GPIO!

Les EDID d'ecran externe par alt-HDMI (DOCK) sont lu par le OS.