The firmware version is displayed when the speaker is turned on: V_0x

SVEN PS-1250 Firmware Update Instructions

To update the firmware, follow these steps:
1) Copy the XXXXXX.MVA firmware file to a USB flash drive. The USB flash drive must be formatted as FAT32 and contain only the firmware file;
2) Turn on the speaker (in any mode);
3) Insert the USB flash drive into the speaker's USB port;
4) Wait until the "UPOH" indicator appears;
5) When the "UPOH" indicator disappears, remove the USB flash drive;
6) Turn the speaker off and on again;
7) The update is complete.