Prepare a U disk in FAT32 format
download update_jmgo.zip to U root directory
U disk access USB2.0 interface.（Since p1 does not have a USB 2.0 interface, so it needs to access to the 3.0 interface）
Open device, enter the set up>-about>-system>-upgrade
Click "Local upgrade" on the system upgrade interface, click "install now" and wait for the upgrade to succeed
The machine will be shut down and opened automatically during the upgrade process, please do not unplug the power supply during the process.