How to cancel G28

Dull in Dallas

Registered Users (C)
Can anyone advise me how to cancel G28. I don' tdeal with my immigration lawyer anymore and I want them not to represent in future. When i filed my I-485, i filled the G28 form. Now how to revoke this? Can i send a plain letter to USCIS or send another G28 form with no attorney's name.
Thanks
 
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