R532L4_11.40.0FR fLEX: GCZ1200L00MSTECLA008 IMEI: 35391201279723 Boot_G_00.02.15R_HAINAN
Its possible its a firmware problem, the firmware you're using might not support volume increase that well, but thats all I'm going to advice, which might not be valid because you did not supply me with all the details. Please post in the forums as I might not be able to reply you on troubleshooting as well as my technical officers. Thank you
Device/gadget information
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