I bought a Nanovna-H from China. The language was Chinese. To make it English I upgrade the firmware. Before updating the firmware the display was ok and horizontal. But after the update, the display is having some issues. It turns into vertical. I can't see the menu also. I tried to search for fixes over the internet but found none that would solve my issue. Has anyone faced the same issue and resolved it? Can anyone help me to solve this issue?

The new NanoVNA-H utilizes an LCD driven by ST7789, and you can acquire firmware files that end with the suffix SM_ST here.
https://github.com/hugen79/NanoVNA-H/releases

Many many thanks, mate. It helps me a lot. Finally able to fix the issue. now it is working fine. Again thanks.
73
S21APJ