I need firmware for my dead player jagga b2407 2.4" screen 1Gb memory

board marked
JR003(2606A)-V2.0 2007-08-13
It has many china analogs:
SPEED MV-9
HS-004
VT-890
DT-M419
C209
JS-249(2.4)
UNIS VP868
UNIS MT-676
MN627
and other, but i dont find any firmware for its.
I download many firmware for many rockchip-based players, but keys or screen dont work.
Help please.