I am guessing you have download and flashed this image published by wika
OpenTS Image 3.7 DM800 Sim2 SSl84D
You have to ask him to publish the patched drivers or to update his build with patched drivers.
DM800HD clones are so old i dubt that there have been any updates for many years so
should not be a problem. And you can test with some other images also. Most of them are correct builds.
images is here: DM800 HD Clone Images
You can go for older images since there has been no new driver updates since 2015 ;)

