FSK problems are mainly caused by the following 4 aspects:1. The machine has been used for a long time and the RTC battery has no power. Replace the RTC battery and import the FSK after replacement.2. The equipment has been disassembled and the anti disassembly has been triggered, so the FSK needs to be imported again.3. The equipment is impacted seriously, and the conductive rubber particles are not well contacted. First, import FSK. If the FSK is still prompted with an error, disassemble the back shell and check whether the conductive rubber particles are installed correctly.4. There is a problem with the motherboard. Replace the motherboard and import the FSK after replacement.