Serial port not sending data with newer Versions of the Firmware?

hi!

Serial port seems to be broken since a while. I haven’t isolated the exact commit,
i’m using HTCC-AM-01 in the Arduino IDE, with the Cubecell support using git.

with this commit the serial port works:
1cda4b33450d3e599d20ee142ebe016da968632e (HEAD)
Author: Linar Yusupov linar.r.yusupov@gmail.com
Date: Fri Nov 27 15:01:26 2020 +0300

better implementation of HardwareSerial::availableForWrite()

with the latest HEAD i don’t get any serial output on the exact same hardware.

my test file is this:

void setup() {
    boardInitMcu( );
    Serial.begin(115200);
    }

void loop() {
    Serial.println("HIkjhkhkjhkh");
    delay(1000); 
}

What did you use to view the serial port information? Serial port module or AM01 peripheral circuit?