Hi,
I tried to upgrade my Rigol DS4014 firmware today, downloaded the latest version 00.02.03.02.00 from the official website, copied it to a USB stick, started the FW upgrade procedure which went fine until about 90%, then on "FPGA upgrade" step it got stuck. Waited for about an hour, then turned the oscilloscope off. Now it only presents a black screen at boot. Any idea how this can be fixed? Tried pressing Help button many times during boot - it doesn't do anything. Thanks