Sure, there is a full history of the .bin files on github : https://github.com/Smoothieware/Smoothieware/commits/edge/FirmwareBin/firmware.bin


If you want to help us isolate the problem, see the building smoothie guides and do a git bisect

+Arthur Wolf Thank you, I will try them and report back.
+Triffid Hunter I will try, but github is totally confusing for me. Probably because I am no native english speaker...

what parameter is used for 'panel.spi_frequency' if I don't put it in the config? There is somehow the problem related. I didn't had it in before and put it in while updating. 

Default value is 1000000

Thank you, now everything works, even with the newest firmware. Sorry for blaming the firmware-update in the beginning ;)

:)

I had the same problem with my azsmz mini when I upgraded. I contacted the seller and he gave me this link which restored the display.
http://www.reprap.org/mediawiki/images/7/76/AZSMZ_FW_Ver2.1.zip



+Vince Lee Yeah providing pre-compiled versions of modified open-source firmware without providing the modified source is just the definition of pure-evil.
They did that already a year back when they implemented servo control but refused to share their changes.
Those guys are just the complete opposite of what the open-source 3D printing community stands for, I just don't get why people keep on supporting them.
Do they have to actually start killing puppies before people start getting upset ?

+Vince Lee It is not the firmware, it is the rather shitty and incomlete config-file from the seller that causes the problem.
+Arthur Wolf I didn't knew that they are some 'bad' guys, before. But I also see no alternative board with similar size...

+René Jurack I believe the v3 of the azteeg x5 board will have removable drivers, also +Ray Kholodovsky is working on something like that ( two boards actually, both of which could fit ).

Yupp, I have a maxed or board with 6 drivers and a mini with 4 drivers, both are swappable. See my profile for more information, and more in the coming weeks.