My setup:
Board: version 3.6 "Extended"
Firmware: 2.70 b6, API v2

I use an Arduino Nano 33 BLE to control the SimpleBGC board through its UART2. It works great. I do real time control (with feedback) without a glitch.

Yesterday I tried to set up a simple serial passthrough: SimpleBGC GUI -> Arduino -> SimpleBGC device (my goal is to avoid using the device USB input). It seems to work correctly for every tuning operation, except when using the "Write" button. On time over three, after a long timeout and very slow moving progress bars, I get this error:
"Something goes wrong when writing parameters:
- Failed to write CAN_drv soft params: java.lang.Exception: No response on CMD_EEPROM_WRITE command
No response on CMD_WRITE_FILE command
No response on CMD_WRITE_FILE command
No response on CMD_WRITE_FILE command
No response on CMD_WRITE_FILE command
- No confirmation on writing