if you want to display on a small LCD like the waveshare 3.5" (or compatible) then you need the special build for the LCD. The non-LCD version of 7.1 will not display on the LCD, you just get a blank screen. I have not tried an update from the older version of the LCD. In any case the newer SD card build is best as it includes the change to debian bullseye.
@eric1tran posted links for the 7.0 version.
https://piaware.flightcdn.com/piaware-sd-lcd-card-7.0.img.zip
I found if you edit the link you can get the 7.1 directly now. The .info file indicates it has the complete set of 7.1 SW, but I did not try it yet, I only built the new SD card using the 7.0 version and upgraded.
https://piaware.flightcdn.com/piaware-sd-lcd-card-7.1.img.zip