Is SPI based 3.5" Raspberry Pi touchscreen possible on new firmware?

I recently updated my Raspberry Pi 3B from v2.66 to v3.62 and lost the ability to use my SPI based touchscreen display. Backlight is on, but nothing on the display. Has anyone gotten these SPI displays to work on a modern (v3.x) version of the firmware?

On v2.66 it’s quite straightforward to get it working by just sticking tft35a-overlay.dtb in /u-boot/overlays/ and adding the following to /u-boot/config.txt:

[all]
dtparam=spi=on
dtoverlay=tft35a, rotate=270 
display_default_lcd=1

The full instructions were located in various places - so it was something that people obviously used. Example here:

Slightly different example here tested up to v2.87:

This old Victron Forum link gives a clue that possibly an updated version of the overlay might work - does anyone know where to get such a thing, these instructions don’t work.

Hi, welcome.

I moved this to modifications - the home of Pi’s.
Do some searching, there are already some topics on this subject.
GUI V2 does not work on direct screens for Pi.

What should I search on? “touchscreen” “tft35a” don’t give me anything.

Closest I found is this one: Raspberry pi Touch screen not working, or calibration problem