Hi Vladimir, As you've found, Debian doesn't yet distribute firmware for the Cirrus CS35L41, although there is an open bugreport to add support for it that you can subscribe to: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1031912
The recommended symlinks to create after installing firmware directly from linux-firmware.git can be found in the 'WHENCE' file in the base directory of that repository (this isn't yet documented in the wiki, and the format of that file may change in the nearish future). Please double-check the symlinks you've created against the 'cs35l41' 'Link' entries in that file, and if necessary, make any adjustments to match. Mismatches there are my best guess at the cause of the firmware loading failures at the moment. Thanks, James