i recently had to change the windshield of my 2019 G30 id7lite. As OEM wasnt available at the moment an aftermarket windshield made by Saint Gobain was installed. The HUD is slightly distorted to a rhombus shape. Nothing major, still annoying.
I found a warp correction service function in ISTA and was able to get the test picture straight again. After saving and exiting, HUD shows nothing. Reset to factory values got the HUD working again, but, of course, warped. Tried it twice, but no success unfortunately.