Are a new Firmware Can change RF Quality?

My SE Z600 have an old firmware because i buy it when it comes first. in my opinion the RF quality of SE Z600 is very bad! If i change the firmware with the latest firmware, it will rise the quality of RF? Please let me know...

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› See More: Are a new Firmware Can change RF Quality?

I've heard that it can increase power to the antenna (at the expense of battery power). I've seen posts on AT&T forums about firmware updates to certain phones like the SE T616 that have proven to increase signal strength.