Instead of overwriting files you should delete tiacx111c16 from /lib/firmware/[kernel version]/acx/default (it links to 2.3.1.31) and create a link to /lib/firmware/[kernel version]/acx/1.2.1.34/tiacx111c16. And repeat after each kernel upgrade.
Instead of overwriting files you should delete tiacx111c16 [kernel version] /acx/default (it links to 2.3.1.31) and create a link to /lib/firmware/ [kernel version] /acx/1. 2.1.34/ tiacx111c16. And repeat after each kernel upgrade.
from /lib/firmware/