OttBox/U2C Z Plus [2G RAM(DDR4)+16 ROM] Can't find Firmware.

[Voxels]

I have been searching for the firmware for 2 days now with no luck. My box says Ottbox on top, under Model: Z Plus, CPU:S912, RAM:2G (DDR4), ROM, 16G.
I understand these boxes are rebranded under other names such as "U2C" but can't find Firmware under Ottbox or U2C.

Here are some links that match my box exactly:

https://www.amazon.com/Amlogic-Android-Box%EF%BC%8C64-Support-1000LAN-OTTBOX/dp/B076LYFSJF/ref=pd_day0_hl_504_24?_encoding=UTF8&pd_rd_i=B076LYFSJF&pd_rd_r=e8ef25ab-e05c-11e8-83e6-73fc6f523755&pd_rd_w=OiKkx&pd_rd_wg=cHX9a&pf_rd_i=desktop-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=ad07871c-e646-4161-82c7-5ed0d4c85b07&pf_rd_r=9F5HTY8TMSMA156QJZG0&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=9F5HTY8TMSMA156QJZG0

https://www.amazon.com/U2C-Android-Newest%E3%80%90Amlogic-Core%E3%80%91-Display/dp/B072C4ZZ4F/ref=pd_sbs_23_4?_encoding=UTF8&pd_rd_i=B072C4ZZ4F&pd_rd_r=1843a071-e05f-11e8-aac7-712434b39254&pd_rd_w=40TNu&pd_rd_wg=bCAUA&pf_rd_i=desktop-dp-sims&pf_rd_m=ATVPDKIKX0DER&pf_rd_p=7d5d9c3c-5e01-44ac-97fd-261afd40b865&pf_rd_r=CBA73AAMSKCQGFYS35HA&pf_rd_s=desktop-dp-sims&pf_rd_t=40701&psc=1&refRID=CBA73AAMSKCQGFYS35HA

Any help would be greatly appreciated!