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I had the same problem as tarumaycry, but I eventually got it working. Maybe this will help:
1. If this is a freshly installed image, run sudo rpi-update to get the latest firmware.
2. Run sudo raspi-config. (or you can also do steps 3-6 on the initial raspi-config on a fresh image.)
3. Go to 8 Advanced Options.
4. Go to A5 Device Tree and choose “No” to disable the Device Tree, and “Ok” on the message saying “Device Tree will be disabled after a reboot”.
5. Go back to 8 Advanced Options.
6. Go to A6 SPI, and choose “Yes” to enable SPI kernel module to be loaded by default.
7. Exit raspi-config and reboot.
8. After reboot, edit the config.txt (sudo nano /boot/config.txt) and remove the line that says “device_tree=” if its there.
9. Make sure there is a line that says “dtparam=spi=on“,
10. Add the line “dtoverlay=piscreen,speed=16000000,rotate=90“.
11. Save, exit and reboot.
Hopefully that will get the PiScreen shining. 🙂