according to article 57 of the trademark law of the people's Republic of China, any of the following acts is an infringement of the exclusive right to use a registered trademark:

(5) changing its registered trademark and putting the goods with the changed trademark on the market without the consent of the trademark registrant;

if you put the goods with changed trademarks on the market and sell them again, with reference to this, you can be sure that your actions infringe the trademark rights of others. The other party has voluntarily brought a lawsuit to the people's court or complained to the administrative department for industry and commerce, and the administrative department for industry and commerce can also take the initiative to investigate and deal with trademark infringement according to its functions and powers.

but if you just change the brand and enjoy it yourself without putting it into the market, then your behavior does not constitute infringement.

according to article 4 of the trademark law of the people's Republic of China, if a natural person engaged in the production, manufacture, processing, selection, distribution of goods or provision of services needs to obtain the exclusive right to use a trademark, he shall apply to the trademark office for trademark registration. To apply for trademark registration and transfer in the name of a natural person, in addition to submitting the Application for Trademark Registration, trademark patterns and other materials in accordance with relevant regulations.