Technically it wasn't.
The steps that you should have done are:
1) Write a contract
describing the change of ownership. List the provisions set forth in the articles of organization and the buy-sell agreement. Describe which owner is leaving and for what reasons and list the new owner's name, ownership interest and responsibilities in the LLC. The contract should transfer all liabilities from the original owner to the new owner.
2) File the COA to reflect the change the ownership of the LLC and who is the managing member.
It's not hard but the formalities should be followed.
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