Sounds like you need to make a channel list by performing a blind scan and ordering the channels, or upgrade your receiver by USB using a ready made channel list for your receiver.
No RS232 needed for this as sounds like your receiver is booting up perfectly fine.
Once you have your channel list to hand on your USB stick you will need to grab your remote and press Menu > System > Upgrade by USB
You will then need to select the file path to point to your channel list and select all SW + BOOTLOADER
Once you have done this you will have a working receiver with your channel list
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