Many of these Covid-19 pages use some fairly advanced web browser capabilities which just won’t be compatible with an android version which is so old.
Unfortunately this isn’t anything to do with Xibo, its the version of Android (and therefore the browser) on the device.
Newer versions of Android will have newer browsers and the results will be much improved I am sure.
If you can find a simpler counter, that might be your best bet - perhaps something from here: https://github.com/pomber/covid19
Thanks,
Dan