MECOOL KM2 PLUS Deluxe TV Box and KODI 21

Hi, I have purchased a MECOOL KM2 PLUS Deluxe TV Box to use with Kodi 21. The problem is that the resolution that Kodi detects is 1920 x 1080p. How can I put it in 4K? Thank you very much.
Both the TV and the TVbox are configured in 4K, but Kodi only detects 1920 x 1080p. Kodi is downloaded from the official website. This TVbox has the Amlogic S905X4-J Quad core ARM Cortex-A55, 24000 DMIPS, ARM G31 MP2 GPU.