Don't send old v1 for upgrades, sell it, & buy a used v1 w/ new firmware!
V1 don't have fancy features like GPS and voice, but IMHO you get one of the most senstive radar detectors on the market.
I have owned 3 of these in the past 10 years and I have only gotten one ticket in that time! I had my JL audio 12”s so loud I didn't hear my v1.
Until you use a v1, you may think other features are more important than the arrows! With other radar that are as sensitive, you are guessing. Is the police in front or behind you!