Can no get ATR files to boot , Side 2 + ultimate 1mb

Hi everyone !!

Received my side 2

Tested ok
Formatted card, all working
xex loader working
spartados working great


But


can not run atr files
with the button on "UP"

i press select and reset , and go to my ultimate menu
I configure side as with button
And pbi 1 –only have ultimate 1 mb and side2 –
Spartados on

Then pressing and hold "L" nothing happens

Side loader not appearing…

please check the video

what am i doing wrong?