Generally, the machine can not be damaged by brushing. Is it your improper method to brush the machine?It is recommended to brush according to the requirements. If you can't get it, you can go after it. After all, it is troublesome.
ZOL Q&A>MP3>system>After the firmware of the TL-X19+MP3 has been upgraded, it cannot be started. After the firmware is refreshed again, it still cannot be started.