Hi vanagaudi, 
My intention was to indicate that while these roads connected various towns and locales, they appeared to be difficult to travel without off-roading capabilities. With that in mind, would it be worth adding surface tags to some of these instead of reclassifying? 

Thank you for your reclassifications so far, I see that there are a few main connections that haven’t been changed back to tertiary. Namely https://www.openstreetmap.org/way/988543578, https://www.openstreetmap.org/way/988541976, https://www.openstreetmap.org/way/988543577 and https://www.openstreetmap.org/way/988527837. I have changed these back, but there may be others, so I will defer to any more classification changes you make in the area.