[SOLVED] 9.1.5 update changed Widescreen orientation

[jmperagine]

Just updated from 9.1.4 to 9.1.5 and the Waveshare DSI 7.9 Touch display rotated 90 degrees.

I was using the instructions posted by felix1024 in post # 6534.

The bootup screen messages did not change orientation nor did the touchscreen orientation.

Fixed!

[Nutul]

(...)
Fixed!

Usually, to help others struggling with your very same issue, the steps followed to achieve the solution are much appreciated.
Thanks.