To retrieve password,you need have Autel IM608 and XP400 programmer.
Steps:
Go to Autel Im608 programmer
Accept the agreement
Chip (eeprom, mcu, ecu) – Chip read & write
IMMO – BENZ – HC05E6-REMOTE (0F82B)
Read and save data
Go to EEPROM for Schematic Diagram
Then read HC05E6 remote
Autel IM608 managed to read chip
Save chip data
Exit
Go to EdHex
Select file that saved just now and check password
The security password of the remote key should be: 7c cf 6a ce 9a ab d9 82
Finished！