Answered by Borut | Dec. 28, 2023 23:46
No, this is not possible because you will not be in a transit and visa free transit scheme in Guangdong province is only possible by entering Guangdong province by air.
Your alternative is to apply for a 5 days Shenzhen visa on arrival at one of designated visa offices located at three border crossings - Huanggang and Lo Wu (Luohu) - overland and Shekou - sea border crossing if arriving by boat. Their opening hours are from 09:00 until 16:30.
In other words, you will be granted this visa, but have in mind that it is relatively steep price for Brazilian citizens - 985 CNY. Also, you are advised to be at the border crossing at the time of visa office opening due to high demand. After your stay in Shenzhen, you are free to return to Hong Kong by taking any border crossing and any mean of transport, high speed train included.