A: Redownload the file or try another build (some versions were signed, others unsigned).
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A: UC 8.7 works best on phones with at least 4MB of available heap memory. Try UC 8.0 or 7.9 for lower RAM. Alternatives to UC Browser 8.7 for Java If UC 8.7 doesn't work on your phone, try: Download Uc Browser 8.7 For Java Jarl