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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！

https://www.obd2tool.com/blog/2020/01/17/how-to-retrieve-password-for-mercedes-motorola-hc05e6-remote-0f82b-with-autel-maxiim-im608/