RockStar 1.77" inch button portable MP4 player - modified firmware
https://aliexpi.com/FawC Hardware price is around 15 $ USD in AliExpress, shipment included. https://aliexpi.com/q1YH Button version without FM radio 11 $ USD (choosing 30 days shipment). Another sellers: https://aliexpi.com/1Z7L Button version (non-touchscreen). Some tests changing icons and power on/off screen.
https://aliexpi.com/FawC Hardware price is around 15 $ USD in AliExpress, shipment included. https://aliexpi.com/q1YH Button version without FM radio 11 $ USD (choosing 30 days shipment). Another sellers: https://aliexpi.com/1Z7L Button version (non-touchscreen). Some tests changing icons and power on/off screen.