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My PiTFT was working fine, with the custom image flashed on the SD Card. But for downloading programs, they say to run sudo apt-get upgrade and sudo apt-get update. I do this, then reboot, now I get a white underscore in the upper-left corner. I ssh into the Pi and run sudo apt-get install raspberrypi-kernel=1.20161027-1. Then I reboot again and it boots up only showing a white screen. Now I can't SSH into it anymore.

I am using a Pi 3 3.5" TFT

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Per the Adafruit Help! FAQ:

Doing an apt-get upgrade or rpi-update will blow away the custom PiTFT kernel.

You will have to reinstall the kernel.

If you had already made a working PiTFT setup, you may be able to reinstall the Adafruit kernel like so:

sudo apt-get install raspberrypi-kernel=1.20161027-1

If it tells you that the latest version is already installed, try this instead:

sudo apt-get install --reinstall raspberrypi-kernel=1.20161027-1

...you can check here and substitute the most recent version you see in the =1.20161027-1 part.

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  • I had the same issue I think I did it 3 times in total. Like Steve Robillard said you can't upgrade the kernel that way, you would have to get adafruits latest. To prevent myself from making the same mistake I set /boot to Read only in FSTAB proc /proc proc defaults 0 0 PARTUUID=f0b6fc3c-01 /boot vfat ro,noatime 0 2 PARTUUID=f0b6fc3c-02 / ext4 defaults,noatime 0 1
    – PInoob
    Jul 23, 2017 at 3:02
  • This may be useful, with the caveat that it does have side effects, but it does not solve the OP's problem.
    – Steve Robillard
    Jul 23, 2017 at 4:47

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