Latest TF536 Firmware?

[PaulJ_2.0]

Have tried with the suggested "WinImage" application, but that one failed the most (asks which partition of the image to open, and fails writing it to the card). I also used the more modern program, Balena Etcher which is highly recommended for writing images (had to uncompress and rename the image file before), success in writing but failed to boot. Next in line was "Raspberry Pi Imager", same "success" as with Etcher.
I've also tried Win32diskimager (ancient) with the same non-bootable result as with the two latter ones.

I was wondering how you managed to have so many problems so I downloaded the image and used my usual and dependable win32diskimager to write the sd card and it worked first time flawlessly.

Maybe your card is faulty?

[peo]

I was wondering how you managed to have so many problems so I downloaded the image and used my usual and dependable win32diskimager to write the sd card and it worked first time flawlessly.

Maybe your card is faulty?

Well, maybe, but the standard rpi os image file was successfully written and booted off that same sdcard.
Some of the image writing tools warned me about the image not being bootable. Anyway, everything was solved once booting a clean RPi OS and installing xc3sprog on that.

[PaulJ_2.0]

So have you managed to program your cpld yet?

[peo]

So have you managed to program your cpld yet?

Yep, PiOS + xc3sprog, then 5V from Pi to the connector between the CPU pin rows.