You can go to Huahai on Zhujiang Road, or Xiongshi, and try to add the same brand, model and frequency with memory, which is more compatible. If it can be turned on on the spot, there is no problem, but if there is a problem with the series in the future, you can pull out a reinstallation, and there is a certain chance that it will not be installed! Ask a few more questions about the price. The competition is fierce now. You can quote the model directly and let him bid. Be confident, no one dares to hack you!