Many newbies want to upgrade firmware thinking "newer is better" While this is generally true, here is a quick summary
Want more performance.
In general, newer firmware doesn't provide more performance. >= 1.73.8 is slightly faster than older firmware. However, flashing 1.73.8 is quite a bit more complicated and higher bricking risk.
Performance Tab provide a summary of how to make HU faster.
Do Simple System Backup before trying any updates in case need to recover from bricking.
These are easier. But still have bricking risk if OTA patch display driver file incompatible to your HU
OTA Update can only update same partition format. There are 3 partition formats. If want to upgrade to differnet partition format, need to do PC flashing
<= 1.73.7
1.73.8 - 1.75.1
1.80.1+
Read OTA Update Tab
This is the most complex to understand and highest chance to cause brick. Study carefully before starting and of course at least perform Simple System Backup First.