The PS Vita firmware version 3.73 is no longer the latest official version (currently 3.74), but it remains a critical target for users who want to apply specific homebrew exploits like or use it as a stepping stone for downgrading
The official download for PS Vita firmware 3.73 could mean a few different things depending on your specific use case. ps vita firmware 373 download better verified
This eliminates 99% of update failures.