Some customers reported that the wallet address could not be modified after receiving the machine. The reason for this problem is that the firmware version burned by the machine during the production aging test process is read-only. Although we will upgrade the version to read-write version after aging test, some machines may fail to upgrade and leave the factory due to imperfect process. To solve this problem, users need to check whether the firmware version is consistent with the latest version of the official website at the first time after receiving the machine. If not, the user should upgrade the machine to the latest version of the official website with the tools provided. As shown in the figure below, you need to upgrade the local version 5.3.6 to the latest version 5.3.9 on the official website.