To get your PS Vita "working better" on firmware 3.73, the standard procedure is to first update to the latest official firmware (currently 3.74, though many guides use 3.73 as a base) and then use a custom firmware (CFW) like h-encore² or HENkaku to unlock features like homebrew and emulators.
Here is a breakdown of how to make firmware 3.73 work better for you, whether you're staying official or going custom. The "Golden Path": Downgrading for Better Work ps vita firmware 373 download better work
If your Vita can connect to Wi-Fi, this is the easiest method. To get your PS Vita "working better" on firmware 3
Successor: Firmware 3.74 (released in May 2022), which introduced mandatory two-factor authentication. How to Download and Install 3.73 Successor: Firmware 3
Firmware 3.73 should be obtained and installed only via Sony’s official update channels to ensure stability, security, and continued access to PlayStation services. Users dependent on unofficial modifications should weigh the trade-offs before updating and perform appropriate backups.