I assume you mean channel 54 (obviously), you wrote 58.
Hand switch = I assume you mean left lever/stalk.
- Check with a multimeter the +30 wire that reaches T16/10 (there should be +/-12V), it is the one that should make the high beam flash work when the light switch is in position 0. Check that the contact terminal is well inserted into the connector.
- You must change the combination switch of the steering column (STALKS) from 6RA to 2Q0, without cruise control (left stalk) and with buttons for MFI (right stalk) 2Q0953513G, that is to say as currently but 2Q0 (search in Skoda Rapid 2019 onwards). This will make your high beam hand switch work correctly and not strangely.
Based on the information in this thread

Undoubtedly you have to parameterize the parking lights (POS) with VCP or ODIS.
Temporarily activate Scandinavian lights (BCM: Byte12 Bit0 , parking lights ON with terminal 15 ON) to make your 'LED' taillights work, although we must find some OEM solution (I'll revisit BCM coding)...




