Selecting the Correct Firmware for Polystar 4K UHD Android TV with TP.HV553.PC821 Board

I have a China Android TV. The board is TP.HV553.PC821 (I opened the TV and saw this number on the board after watching different YT videos),

The fault is that it hangs on the Wisdom SHare screen, doesn't go past that screen. I have read that I need to update the firmware with a flash drive. I have over 10 years of experience in a firmware update in mobile phone repairs, so I know about firmware updating and I am 100% sure I know the process of firmware updating using USB (and the file inside of it).

What I need to understand here is WHICH FIRMWARE SHOULD I DOWNLOAD?

The TP.HV553.PC821 has much firmware as I can see from the search, so I am confused about which to download.

My TV is a 4K UHD 50 inches (Brand name is Polystar - a China OEM brand sold in Nigeria)

https://www.soft4led.com/2020/07/tp-hv553-pc821-firmware-free-download.html

jeloi wrote:

https://www.soft4led.com/2020/07/tp-hv553-pc821-firmware-free-download.html

Thanks for your response.
As you can see on the page you pointed me to, there are different firmware. Which do I download?
Or do I have to download all and unzip to get 1 big file?

dannyme wrote:

jeloi wrote:

https://www.soft4led.com/2020/07/tp-hv553-pc821-firmware-free-download.html

Thanks for your response.
As you can see on the page you pointed me to, there are different firmware. Which do I download?
Or do I have to download all and unzip to get 1 big file?

I have the same problem with the same main board TP.HV553.PC821 but in StarSat 50 inch 4k. Please help, did you find a solution?

I have den-b 5500 (55 Inch) TV with board: TP.HV553.PC821B firmware version: 20191223_193742, Android 7. It is hanging on wisdom share logo and some times pop ups coming about some applications or services have stopped. Can I have new firmware to upgrade this board. If you can send me a link to download firmware which is compatible with this I really appreciate.