SuperMaximus

@Coulomb I would probably think of resistor like you proposed if my MCU wouldn't get flashed successfully. But it was flashed normally using the same cable and then I tried to do the same with DSP. I have 2 inverters of the same model and I tried flashing both. One has no PV connection at all, functioning as battery<->grid only, another one has 1 MPPT connection. I didn't try with 2400 bps, but 9600 / 19200 gave me no luck. I flashed another inverter's MCU/DSP (Voltronic Axpert MAX II 11K Twin / Axpert MAX E Duplex 11KW) with the same cable/adapter another day and it went well. Will be grateful for any help!

Hey folks, I hope somebody would help me with the issue I encountered with my two autonomous Voltronic inverters. A friend of mine sent me this firmware and I followed the guide for flashing MCU & DSP. MCU flashed successfully, but DSP flashing couldn't succeed. From WatchTower: Main CPU firmware version: 00045.04 Secondary CPU firmware version: 00012.28 The dsp 245.11 .exe firstly argued that it couldn't open COM port. COM port is OK, I am using the same USB-RS232 adapter to flash other inverters and two Xpert Max 7.2 KW got MCU flashed with it. WatchTower opens port as well. Then I tried to put patched "dsp.hex" inside Remote Panel Reflash folder from where I managed to flash MCU and press Update DSP. Inverter's display went off and didn't get back to on state until I reflashed MCU again. How can DSP be flashed without the risk of bricking of these inverters? Thank you in advance! dsp 245.11 patched Max 7.2kW '2809 120V.zip Remote Panel_Reflash_MCU(12.28).zip