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Boomsbox mini (HF9234-25E-V2 board)

I don't have this thing anymore because it wasn't mine at all.

Some JBL-ish bluetooth speaker...

The speaker

Board top

Board bottom

Chip closeup

Pin usage

Pin Usage
PR1 Power button
PR2 Amplifier shutdown
PA0 Microphone
PA3 AUX in
PA4 Keys1
PB0 Onboard LEDs (BLUE1 and BLUE2)
PB4 Keys2
PB5 Keys3
PC5 SD card CLK
PC4 SD card CMD
USBDM/PC3 SD card DAT0, USB D-
USBDP USB D+

Keys are connected as follows:

Keys schematic