UPDATE: I have replaced the Si4732A10 and now it works, no more crashes when I select HAM band. Thanks for your help!!!

what do you mean by keys? the mosfet's? i now have the SI4732 without GPIO wiring...but it still freezes. Is it possible that the chip has already been damaged?

[https://github.com/IU4ALH/IU4ALH/tree/main/PCB's] i use the 12.1.rar , Today I reinstalled the complete firmware with H-radio Installer. I also ran the format, but nothing changes. As soon as I select the HAM button and a Ham band (20m or 40m), everything hangs up. what is also strange is that the ...

Its a 4" Selfmade with PCB from PU2CLR / IU4ALH / ASSUNCAO . the PCB works fine...

I´m a HAM , DG3VG , but I also don't know that you can set this separately!

FW 4.20 AIR 4" full version, when I go to HAM and select a band there, e.g. 20m, the ATS hangs. and this happens when I call up every HAM band. Everything else works. What can this be?

no

WLAN activ? PLS deactivate it bevore

Thanks, great news... 73. Klaus

What is the function of the PCF8575 that I can see on the start screen? It is an I²C I/O expander, why do we need more I/O's ?