File/Direcory File Size Date
.. - 2020-04-10
4.20.000 build 181107 - 2019-12-13
4.20.001 build 190430 - 2019-12-13
4.20.100 build 181204 - 2019-12-13
4.21.000 build 190722 - 2019-12-13
4.21.002 build 190925 - 2020-02-07
4.21.100 build 200307 - 2020-04-17
K Series Firmware_old version - 2018-12-03