G1 cannot flash latest firmware

[Bodad]

Hi.  My G1 isn't connecting to the mobile network.  This happens regularly.  A simple reboot sometimes corrects this but ultimately, a firmware flash is the only way to reinstate mobile connectivity.  However, when I try to re-flash the G1 with KCS_G1_V3.19.1.bin, the flash    
interface starts the erase process but when the installation process starts, it report that the device has been reset to firmware mode?
   

I'm using Tasmota web installer to flash.  It has always worked before.  How can I re-flash the G1?

Thanks in anticipation.

[admin]

note: if download failure. You can do these steps, let controller ESP32S3 enter BOOTLOAD again:

1. power off KinCony Controller.
2. hold on DW (ESP32 download button), don’t move your finger.
3. power on of controller
4. release your finger.
5. Then controller enter bootloader mode. download firmware again.

[Bodad]

note: if download failure. You can do these steps, let controller ESP32S3 enter BOOTLOAD again:

1. power off KinCony Controller.
2. hold on DW (ESP32 download button), don’t move your finger.
3. power on of controller
4. release your finger.
5. Then controller enter bootloader mode. download firmware again.

I'm afraid that didn't work.  It looks like the COM port is resetting itself every few seconds.  I've taken a video of it but can't upload a .mov file here.  I've also used the Espressif ESP Tool where the COM port keeps dropping although I did get the following from the upload log:

esptool.js
Serial port WebSerial VendorID 0x303a ProductID 0x1001
Connecting...
Detecting chip type... ESP32-S3
Chip Revision: 0
Chip is ESP32-S3 (QFN56) (revision v0.2)
Features: Wi-Fi,BLE,Embedded PSRAM 8MB (AP_3v3)
Crystal is 40MHz
MAC: d8:3b:da:a8:94:dc
Uploading stub...
Running stub...
Stub running...
Changing baudrate to 921600
Changed
If the chip does not respond to any further commands, consider using a lower baud rate.
Flash ID: 1840c8
Compressed 3150224 bytes to 1116917...
Writing at 0x1000... (1%)
Writing at 0x81ed6... (2%)
Writing at 0x8fe94... (4%)
Writing at 0xa0057... (5%)
Writing at 0xae726... (7%)
Writing at 0xcd6e0... (8%)
Writing at 0xfdcf7... (10%)
Writing at 0x1173f4... (11%)
...
...
Writing at 0x2f4f84... (97%)
Writing at 0x2fb946... (98%)
Writing at 0x300bfd... (100%)
Wrote 3150224 bytes (1116917 compressed) at 0x1000 in 17.918 seconds.
File  md5: 58d6b8eb6d38280482d43c87a4de4400
Flash md5: 58d6b8eb6d38280482d43c87a4de4400
Hash of data verified.
Leaving...
Hard resetting via RTS pin...

However, the device doesn't respond at all now
   

I've tried holding down the DL (DOWNLOAD) button while transferring the bin file over USB cable.  Also tried two different cables and a different computer, all with the same result.  Any further advice on what to do next?

[admin]

It looks like the COM port is resetting itself every few seconds. --> this is normal.
send your video to whatsapp number: +86-15381188302 let me see how you did.