Hi Marcin,
I reactivated my old Reycom REC100 with DuoFlexS2 Tuner and Gen2VDR installed on the 8GB SSD.
It is the same System as yours sold from DD.
The REC100/MCC100 has a special build in X10 RF receiver conncted to intenal USB which also can switch on the system from S5 with the PowerButton of the RemoteControl.
This Pwer-On function works independent of the installed OS and also works with MLD 6.5 which I installed instead of Gen2VDR on the internal SSD.
But I can confirm that this internal X10 RF Receiver of the REC100 can not be cofigured with the MLD 6.5 WebIF and therefore is not working with the VDR.
Problem ist that the ati_remote kernel module of Kernel 6.6.21 does not know the device ID 0bc7:000c of this internal X10 receiver.
I connected a external Medion X10 RF receiver with device ID 0bc7:0006, witch can be configured with the WebIF and works perfect.
Modinfo for ati_remote shows that the module knows device ID 0bc7:0006 of the extrenal X10 receiver but not the device ID 0bc7:000c of the internal REC100 receiver.
root@MLD65REC100:~# modinfo ati_remote
filename: /lib/modules/6.6.21-yocto-standard/kernel/drivers/media/rc/ati_remote.ko
license: GPL
description: ATI/X10 RF USB Remote Control
author: Torrey Hoffman <thoffman@arnor.net>
alias: usb:v0BC7p0008d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BC7p0006d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BC7p0005d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BC7p0004d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BC7p0003d*dc*dsc*dp*ic*isc*ip*in*
alias: usb:v0BC7p0002d*dc*dsc*dp*ic*isc*ip*in*
depends: rc-core
retpoline: Y
intree: Y
name: ati_remote
vermagic: 6.6.21-yocto-standard SMP preempt mod_unload
parm: channel_mask:Bitmask of remote control channels to ignore (ulong)
parm: debug:Enable extra debug messages and information (int)
parm: repeat_filter:Repeat filter time, default = 60 msec (int)
parm: repeat_delay:Delay before sending repeats, default = 500 msec (int)
parm: mouse:Enable mouse device, default = yes (bool)
So ati_remote is ignoring the internal X10 receiver and does not load the keymap rc-medion-x10-or2x.
As result the receiver is not recognized by the MLD WebIF and can not be configured.
I could not find out, since which kernel version device iD 0bc7:000c is not any more supported.
Older kernels like in MLD 5.3 (maybe also in 5.4 and 5.5) are suporting the device ID.
My combination of the internal and external X10 receiver works fine with MLD 6.5.
With the internal I can switch on the system and with the external I can control VDR with the same RemoteControl.
On eBay you can find such "medion remote rf x10 usb" external receivers inl. RC.
https://www.ebay.de/sch/i.html?_nkw=medion+remote+rf+x10+usb&_sacat=0&_from=R40&_trksid=m570.l1313&_odkw=medion+rf+x10+usb&_osacat=0