I have a Chinese phone Nokia C30mini java : it is also called Lenovo C30 mini , but in reality it is - MORE C30 mini

[VERSION] HF713_32_JHT_F11_BT_FM_F11_PA_V1.28_130327_PATCH1020 . [BRANCH] MT6253_GEMINI
[TGT] HF713_8851A_3216_QQVGA . [ASIC] 8809 . [DIE] 8809 (0x6) . [PKG] CT8851A . [RFPA] pasw_rda6625 . [FLSH] flsh_spi32m . [LCD] ili9163c . [CAM] gc6113 . [BT] rdabt_8809 . [FM] rdafm_8809

Code *#002# for FULL factory reset - cured my phone from reboots and other nasty glitches!

Here is the list of working codes for cheap (<$25 at AliExpress) dual-sim noname phones with camera and bluetooth - they often have Coolsand rda8851a / Coolsand CT8851A CPU. Secret codes should be entered at the home screen of phone:

*#002# - FULL FACTORY RESET
*#87# and *#88# - Phone Test
*#06# - show IMEI of phone
*#8375# and *#8376# - Software/Hardware Info
*#3641# - Engineer mode. Be wise while changing hidden settings.
*#3696# - Firmware USB update mode. Don't install wrong firmware!