Messed up textures after updating to Lightweight Render Pipeline

I was working on one of Unity's tutorial projects(the cute nightmare survival one) and wanted to add something cool using Lightweight RP. But upgrading to Lightweight RP messed up my textures. Apart from turning to everything pink when I go Edit>Render Pipeline>Lightweight RP>Upgrade Project Materials....; some of the objects still remain pink and when I manually set their shader the original texture is lost. I am currently using Unity 2019.2. Before using Lightweight RP After using Lightweight RP

Also it would be really helpful to do something about the lighting as after LRP it gets really dull and also I have an in game option for setting the brightness of the game which becomes useless after upgrading.