Firmware infos:

Build Version : J306_RY_G3403_L40_324_V01_20191126
Display ID : MRA58K release-keys
Ver. Incmt : eng.android204.20191227.142727
Ver. Release : 6.0
Build Time : 12/27/2019 6:29:05 AM
Product Model : L40
Product Brand : SPRD
Product Device : sp7731c_1h10_32v4
Product Board : sp7731ceb
Product Manfct : L40
Board Platform : sc8830
Product Info : sp7731c_1h10_32v4

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