Прошивка для автомагнитол на платформе Allwinner R16, T3, T8, TS9, TS10, TS18

Please help. After changing the bootlogo to a picture i am stuck in a bootloop displaying half of the bootpic.
I can not go in recovery
tried multiple versions : keyboard alt print + i various reset+power reset+home combinations, key1 or key2 on ground = no luck.

this is my radio
https://ibb.co/g7x3QcR

Please help