Including a note about where to find the firmware would be helpful. If there's an official source or community repositories, that's important. Also, safety precautions when updating firmware to avoid bricking the device.
: This is the most comprehensive resource for the H616. You will find stock and custom ROMs (like SlimboX) specifically for sun50iw9p1 sun50iw9p1 firmware free
Can be found on community sites like AndroidPCTv or 4PDA . Including a note about where to find the