If the links above do not match your board, here are the reliable sources:
Finding firmware for Amlogic devices can be tricky because amlogic s905l2 firmware link
Always back up your original firmware using aml_dtb or dd before flashing. If the links above do not match your
Determined to liberate the hardware, the user cracked the case open. There, hidden under a tiny ceramic heatsink, was the heart of the machine: the Amlogic S905L2 The Rabbit Hole hidden under a tiny ceramic heatsink
Locate the PCB (Printed Circuit Board). Look for a silkscreened model number like:
Updating firmware on an Amlogic S905L2 Go to product viewer dialog for this item.