Once you have the .afw file:
If the software does not automatically find the update (a common issue with older website versions of ACC), try these "good report" fixes: HOW TO FIX ASTRO A50 FIRMWARE UPDATE ERROR astro a50 gen 3 firmware download
Depending on your platform, download the official software from these sources: Once you have the
To avoid searching for dead links again: astro a50 gen 3 firmware download
These are the last official versions released for Gen 3 before EOL.