I managed to reset the security code!

As follows:

 1. enable extended commands (0x64 0x01)

1e 00 0c 40 00 06 00 01 64 01 01 41 77 07 

 2. set new code command and the new code is 12345 (see bytes 31 -> 35):

1e 00 0c 40 00 0c 00 01 6f 01 31 32 33 34 35 00 01 46 4b 0c 

 3. disable extended commands (0x64 0x00)

1e 00 0c 40 00 06 00 01 64 00 01 40 77 07

I'll explain the frame later.