Audi Concert CD2: CAN-Bus Activation Issues

Hello.
"There's a Radio with part number 8P0035186. I'm trying to send commands to it using can tool. I've managed to turn on the key backlight by sending the command 0x635 1 00 64 00. I can also adjust the volume via the CAN bus. However, I can't turn the radio on via CAN. The command 0x271 1 07 doesn't work. Neither do 0x3C0 3 00 00 03 or 0x3C0 00 00 07. I've also tried ID 0x2C0. But nothing works. What could be the problem?"