[SM-A207F] Failed to send handshake

[TheAirBlow]

First my tool Hreidmar was unable to send handshake, which makes debugging for me impossible.
After that tried to do the same thing with Heimdall - I get the same error.

This device is most fucked up thing I've ever seen. Firmware is Samsung Official, but it FOTA says that it's not.
Bootloader doesn't let to flash custom firmware even with unlocked bootloader, and now I can't even establish a connection.

What the fuck, and how do I fix this?
P.S. Not a problem with the cable or drivers - I have two of them and none of them worked, and LibUSB works for other devices.

The strangest thing here that I flashed firmware before, successfully.
After a few days no connection could be established. What?

[TheAirBlow]

Also, it resets the device first:

        /// <summary>
        /// Initialize an USB device
        /// </summary>
        /// <param name="device">USB device</param>
        public DeviceSession(MonoUsbDevice device)
        {
            void CheckForErrors() {
                if (_error != MonoUsbError.Success) 
                    throw new Exception($"{_error}");
            }

            var mono = device;
            if (UsbDevice.LastErrorString.Contains("Access denied", StringComparison.CurrentCultureIgnoreCase))
                throw new Exception("Access denied!");
            _deviceHandle = mono.Profile.OpenDeviceHandle();
            _error = (MonoUsbError) MonoUsbApi.ResetDevice(_deviceHandle); CheckForErrors();
            _deviceHandle.Close();
            _deviceHandle = mono.Profile.OpenDeviceHandle();
            _device = device;
            Initialize();
        }

[TheAirBlow]

P.S. Other guy with the same device (and latest firmware) reported that connecting works. Something is wrong with mine.

[TheAirBlow]

I'll try to reset before handshake, not before initialization.

[TheAirBlow]

I'll try to reset before handshake, not before initialization.

That fixed it for Hreidmar (my tool). Also, it's a duplicate.