Isn't there a weather on your lg g4? Why would you want the g2's. You could search your G2's weather apk file on internet from G4 and install it from there.
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It is illegal in some country. But the only way is to find an app that has this feature or root your phone and install some tweaks that will allow it.
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Hi, if it only boots in TWRP you could restore the Stock backup if you still have it. If not. You should flash your G3 variant's factory image that you can find on the internet.
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How did you lose them in the first place. You should've backed up with an app like CM backup before doing whatever you did.
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