My pico ist unable to activate the bootloader to upgrade the firmware 1.93 to 1.99

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jm
Tank for all advices.
I've done all these tests:
1. I can program the pico. The connection to the IDE is ok.
2. The alternate flashing of the two ED I could not watch. Thus, the boot loader could not be activated.
3. I did the detection test of the button with "digitalRead (BTN1)". There was always only level "0", the test with "var iid = setInterval (function () {LED1.write (BTN1.read ());}, 100)" did not produce any result - the flashing of the LED did not change.

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