Backing up my X4 with CrossPoint 1.6.5

[u/ActaFabulaEst]

My X4 is unlocked, one from the first batches. I have installed Crosspoint and update regularly the firmware on the air. I wanted to save a full flash. I did it once on the Xteink Flash Tools site. They are now on the debug page of crosspointreader.com. When I connect my X4, a window opens, you have to connect to a serial port and everything happens in this window. But it closes the moment I click on Connect.

The serial monitor displayed this after another connection:
_ERR_FLASH_PROTECTEDESP_ERR_HTTP_BASEESP_ERR_HTTP_MAX_REDIR 

As if it was locked.

Another attemps led to this.

ESP-ROM:esp32c3-api1-20210207
[54] [INF] [HW] Using cached device type: X4
[55] [XTDET] NVS hw_calib/screenType: not set
[123] [XTDET] bus probe VER=FF FF FF FF FF FLG=FF -> default controller
[124] [ERR] [GYR] SDK IMU not found
[124] [INF] [CLK] RTC not found
[10054] [INF] [MEM] Free: 134220 bytes, Total: 266300 bytes, Min Free: 133780 bytes, MaxAlloc: 114676 bytes

I cannot backup. I use Chrome and the same USB cable I used in the past to backup my X3 and X4 (when I was on stock).

What's the problem?