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It may be the same as my Cubot GT88.
To use a different one of the preset ones, applications> settings > audio profiles.
, then tap on the picture of faders on the right. And the settings will appear
For voice calls, video calls , and default notification sound. Tap on the one you want to change
Did you replace the battery with a new battery, or one known to be good? With the CORRECT battery? If the new battery's polarity is opposite the original battery, you probably destroyed the phone. The same thing may have also destroyed the charger.