RadioGears releases "firmware v1.65" which has improved the below.
[1] Improved the Speed of FF / REW for MKV [2] Improved REW problem for AVI [3] Supports WMV Codec of MVK [4] Corrected AVI sound error
[HOW TO UPGRADE] 1) insert USB memory to the front USB slot with the downloaded FW 2) turn it off and on for USB drive activation (in case it's not activated at once) 3) follow the download process
Setup -> ETC2 -> Firmware Upgrade [ -> Firmware Upgrade ] -> ¡°OK¡± (Current Ver 1.** >> Latest Ver 1.65)
* please do not power off the device before completing the downloading process.