To install a new firmware

yes: G90-ZX-A770-990-S7H and G90-ZX-A770-1110-S7H
I don't recommend G90-ZX-A770-1110-S7H because the speed is in MPH and it is always displayed (no mater if the GPS is On or OFF).
 
What's the improvement on video/audio quality, if any?
 
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